Huh? How do you "split" an AZW4?
AZW4 is a plain wrapper around a PDF -- no conversion necessary. If KindleUnpack is running out of memory before finishing the Unpack, you need a computer with more RAM.
You must use a 64-bit OS as well!
Alternatively, you can try the standalone KindleUnpack python application, which should be linked on the KindleUnpack calibre plugin thread.
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