Complex sentence: Rosenborg has entered the UEFA Champions League and its predecessor, the European Cup, 20 times, and reached the group stage 11 times, including eight consecutive seasons from 1995--96 though 2002--03.
Split into simpler sentences: Rosenborg has entered the UEFA Champions League and its predecessor, the European Cup, 20 times. This includes reaching the group state 11 times, including eight consecutive seasons from 1995--96 though 2002--03.