Complex sentence: Fenner hears all the shouting and enters the cell to find Hedges there, a nurse then enters the room and Fenner, not wanting his secret with Shell and the other officers exposed, lies and tells the nurse that Shell tried to smother her baby.
Split into simpler sentences: Fenner hears all the shouting and enters the cell to find Hedges there. A nurse enters the room and Fenner, not wanting his secret with Shell and the other officers exposed, lies and tells the nurse that Shell tried to smother her baby.