Complex sentence: Finally, Meg pays four of the toughest students in school to beat up Mike for $1,000 only for Mike to kill them all and write that Meg is next on the hallway wall in their blood.
Split into simpler sentences: Finally, Meg pays four of the toughest students in school to beat up Mike for $1,000. Mike kills them all and write "You're Next, Meg" on the hallway wall in their blood.