Complex sentence: In 2003, WCSH launched "207" (a local magazine show) that airs weeknights at 7 P.M. on WCSH, as well as the next day at 4 A.M. on WLBZ and WCSH.
Split into simpler sentences: In 2003, WCSH launched "207" (a local magazine show) that airs weeknights at 7 P.M. on WCSH. It airs the next morning at 4 A.M. on WLBZ and WCSH.