Complex sentence: After participating in the LSD experiment, he was inspired to write "One Flew Over the Cuckoo's Nest", bought an old school bus, painted it with psychedelic graffiti and traveled the country with a group he dubbed the Merry Pranksters.
Split into simpler sentences: After participating in the LSD experiment, he was inspired to write "One Flew Over the Cuckoo's Nest". He bought a school bus and painted it with psychedelic graffiti and traveled with a group he termed the Merry Pranksters.