Complex sentence: The Yuma Rebellion occurred in the summer of 1781 in response to Captain Fernando Rivera y Moncada and his group of more than one hundred settlers over-staying their welcome at a nearby mission.
Split into simpler sentences: The Yuma Rebellion occurred in the summer of 1781. The rebellion was a response to Captain Fernando Rivera y Moncada and his group of more than one hundred settlers over-staying their welcome at a nearby mission.