Original sentence: Suggested explanations for the reduced number of broadcast viewers were: the long period between seasons, a change in time slot (Friday evening instead of Saturday morning), the increased availability of digital download services, and generally reduced ratings for the Nickelodeon channel
Edited sentence: The reduced number of broadcast viewers was thought to have been influenced by the long period between seasons, a change in time slot (Friday evening instead of Saturday morning), the increased availability of digital download services, and generally reduced ratings for the Nickelodeon channel