Complex sentence: Dylan plans to go to a party and is asked to take some drugs with him, but Ken mixes up the drugs with some medicinal pills for his back pain and goes to Dylan's party with Cuckoo causing chaos.
Split into simpler sentences: Dylan plans to go to a party and is asked to take some drugs with him. But Ken mixes up the drugs with some medicinal pills for his back pain and goes to Dylan's party with Cuckoo causing chaos.