Midi file imports as non monophonic, when part is monophonic, how to repair?

I've recently discovered the utility of importing midi files as a time saver for note entering. But my most recent example is importing as if there are parallel parts, even though the midi file clearly has no notes that overlap in time. Why might this be? In any case, I can't figure out how to get rid of the "parallel rests" in bars 3 and 4 without getting rid of the notes. How do I do this?

I'm including a screenshot as PDF, plus the midi file