Complex sentence: The channel was broadcasting from 6AM to 12AM in Afghanistan (Afghan time), so when it was available in Europe, it was being broadcasted from 1:30AM to 7:30PM (GMT).
Split into simpler sentences: The channel was broadcasting from 6AM to 12AM in Afghanistan (Afghan time). When it was available in Europe, it was being broadcasted from 1:30AM to 7:30PM (GMT).