Complex sentence: Unlike competitions like Academic Decathlon, there are few published materials that aid students in preparing specifically for quiz bowl competitions, however, since questions are generally derived from an unofficial canon of topics players commonly review question content from older competitions to prepare for upcoming tournaments.
Split into simpler sentences: Unlike competitions like Academic Decathlon, there are few published materials that aid students in preparing specifically for quiz bowl competitions. Since questions are generally derived from an unofficial canon of topics, players commonly review question content from older competitions to prepare for upcoming tournaments.