Complex sentence: Blair Academy has been the dominant basketball program in recent years, compiling a 63-12 record since the league's inception in 1999 and winning 7 of the last 10 league championships.
Split into simpler sentences: Blair Academy has been the dominant basketball program in recent years. Compiling a 63-12 record since the leagues inception in 1999 and winning 7 of the last 10 league championships.