Complex sentence: Helen was devastated and although she returned home from the hospital, she later died in her sleep whilst sitting in a chair with a blanket over her legs, leaving Tom, who survived the crash, an orphan.
Split into simpler sentences: Helen was devastated and although she returned home from the hospital, she later died in her sleep whilst sitting in a chair with a blanket over her legs. This left Tom, who survived the crash, an orphan.