Complex sentence: The plan worked and Dinah told Hart that she was pregnant with his child.Marcus, a friend, who figured out what Dinah had done, tried to convince her to do the right thing, she was obsessed with getting Hart back and went along with the lie.
Split into simpler sentences: The plan worked and Dinah told Hart that she was pregnant with his child. Marcus figured out what Dinah had done, and tried to convince her to do the right thing, she was obsessed with getting Hart back and went along with the lie.