Complex sentence: They reveal to him that Dave is in Fairview, and Dr. Heller immediately travels to Wisteria Lane, only to be strangled in the storage room of The White Horse Club, where Dave's band has entered a Battle of the Bands competition.
Split into simpler sentences: They reveal to him that Dave is in Fairview, and Dr. Heller immediately travels to Wisteria Lane. He finds Dave at The White Horse Club, where the band has entered a Battle of the Bands competition.