This is just one of the many reasons PDF is such a horrid format to use for conversion. The best fix is to avoid PDF and use some other format as a source for the conversion.
If that isn't an option then you might try turning on Heuristic Processing and check the option there for Unwrap Lines. Try several conversions using different values. A search of the Stickies in this section of the forum will lead you to some suggested values. Whether or not you can find a value that works for this file is a matter of trial and terror.
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