Complex sentence: In the morning Annemarie spots her mother in the distance crawling because she broke her ankle and when she goes back she sees a package that is important to the Resistance was accidentally dropped by Mr. Rosen when he tripped on a flight of stairs.
Split into simpler sentences: In the morning, Annemarie spots her mother in the distance, crawling because she broke her ankle. When she goes, she sees a package, important to the Resistance, that Mr. Rosen accidentally dropped when he tripped on a flight of stairs.