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I've been around internet for awhile to see if there is a solution regarding cropping those double page PDF files into one-page PDF file. After a bit of research, I found the absolute solution. It might look a bit long and exhausting but once you get the idea, it is actually a very easy process. By the way, apologies for my bad English.

The only thing you will be needing:
Adobe Acrobat Professional 9 and nothing else. No scripts, [inappropriate adjective deleted by moderator] software sold for 9999 dollars or shit.

Let's begin:

First, we have to do some preparation before execution.

Preparation:

Let's say double-page PDF filename is Insomnia.pdf

1) Create two new folders. (Let's say first folder name is L and the other is R).
2) Copy & Paste Insomnia.pdf into both of these folders.

That's it. Now the solution:

1) Open the L folder.
2) Open the Insomnia.pdf with Adobe Acrobat Professional.
3) Click 'Document' and then click 'Crop pages'
4) Use Left button. Move the frame to just in the middle of the two pages.
5) Under 'Page Range' click 'All'.
6) Next to 'Apply to' click 'Even and Odd Pages'.
7) Click OK. Now all the left side of each page is removed. We have a lot to do still though.
8) Click 'File', then move to 'Export', then 'Image', then 'JPEG'.
9) It will ask you to choose a filename. Make it something short, preferably three letters, such as, 'Asd'.
10) Click 'Save' and wait a few minutes until it finishes.

We haven't done yet. We are done with the L folder. Now we have to do the same with R folder. However this time, we will crop right side of each page. But the most important thing is that when you are going to export images, you have to choose the same filename, that is, Asd. This is essential. Now anyway I'm explaining R folder in detail:

1) Open the R folder.
2) Open the Insomnia.pdf with Adobe Acrobat Professional.
3) Click 'Document' and then click 'Crop pages'
4) Use Right button. Move the frame to just in the middle of the two pages.
5) Under 'Page Range' click 'All'.
6) Next to 'Apply to' click 'Even and Odd Pages'.
7) Click OK. Now all the right side of each page is removed. We have a lot to do still though.
8) Click 'File', then move to 'Export', then 'Image', then 'JPEG'.
9) It will ask you to choose a filename. Use the SAME FILENAME you chose before, Asd.
10) Click 'Save' and wait a few minutes until it finishes.

Now it is time to combine both of those images. However if you don't follow my exact steps, you might have pages that goes like 2, 1, 4, 3, 6, 5 etc in the end. So do exactly as I say, don't do anything different.

1) Open R folder. Not L.
2) Select all JPEG images in the folder (Asd_Page_001, Asd_Page_002, Asd Page_003...)
3) After you selected all the JPEG images (make sure you didn't also select Insomnia.Pdf) right click one of these images and then click 'Combine supported files in Acrobat'
4) Good, don't touch anything on this screen.
5) Now go to the L folder.
6) Again, select all JPEG images, (make sure again Insomnia.Pdf is not included into selected files)
7) Now, don't right-click on an image this time, but MOVE these files onto the Adobe screen, just like you move a file to another folder, move it to 'Combine Files' screen which is already opened.
8) Now don't touch anything on screen, such as deselecting files, don't click anywhere.
9) Click 'Name' column twice.
10) Click 'Combine files', choose an output file name.

That's it. This new file will have one page per screen. But the end result might have this problem: Filesize might be too big even if the original file was small. New file might be 200 mb. But this can be easily solved. Open the new file with Adobe Acrobat Professional, click Document, click Reduce file size and click ok. This might take a few minutes but it will reduce file size a lot to put it onto your kindle, mobireader whatever.

A VERY IMPORTANT NOTE: You can take notes, highlight text, look up for dictionary when using this in your device. No worries.