Complex sentence: In 1980, KXTX reduced Sunday religious shows from the entire day to 6-10 a.m. and 7 p.m.-Midnight and therefore began broadcasting secular shows in the afternoon on Sundays.
Split into simpler sentences: In 1980, KXTX reduced Sunday religious shows from the entire day to 6-10 a.m. and 7 p.m.-Midnight. It also began broadcasting secular shows in the afternoon on Sundays.