Complex sentence: They travel to the bar, where Johnny notices a former henchman of Dr. Z. After the group gets involved in a bar brawl, they then travel to Dr. Z's home, and Johnny confronts him believing he killed their therapist, but Dr. Z denies it.
Split into simpler sentences: They travel to the bar, where Johnny notices a former henchman of Dr. Z. The group then gets involved in a bar brawl. They then travel to Dr. Z home, and Johnny confronts him believeing he killed their, but Dr. Z denies it.