Complex sentence: While Sam and Spitz are having sex in the barn, Michael murders them, then leaves the barn and kills two deputies that Loomis had asked to keep an eye on Tina for her protection.
Split into simpler sentences: While Sam and Spitz are having sex in the barn, Michael murders them. Michael then leaves the barn and kills two deputies that Loomis had asked to keep an eye on Tina for her protection.