Complex sentence: In one season, the family built Joey a bedroom in the basement, one reason being that D.J. felt sorry for him because he had to sleep in the cold and he didn't have a bed or closet to keep his clothes in.
Split into simpler sentences: In one season, the family built Joey a bedroom in the basement. One reason being that D.J felt sorry for him because he had to sleep in the cold and he didn't have a bed or closet to keep his clothes in.