Complex sentence: A little while later the same car picks up a little boy wearing a white suit who the woman and her nephew soon relise is the genetic evil the old man warned them about but by that time they are too late.
Split into simpler sentences: A little while later the same car picks up a little boy wearing a white suit. The woman and her nephew soon realise the boy is the genetic evil the old man warned them about, but by that time they are too late.