Complex sentence: When they ran out into the street, someone asked if there was anyone else in the house, thinking that Ted Gold, the other Weatherman in the townhouse, had gone to the store, Wilkerson replied that no, there was no one left inside.
Split into simpler sentences: When they ran out into the street, someone asked if there was anyone else in the house. Thinking that Ted Gold, the other Weatherman in the townhouse, had gone to the store, Wilkerson replied that no, there was no one left inside.