Complex sentence: All 4 is the main source of on demand programmes from Channel 4, E4, and More4, the catch up service currently lasts 30 days and the archive has thousands of hours of programming.
Split into simpler sentences: All 4 is the main source of on demand programmes from Channel 4, E4, and More4. The catch up service currently lasts 30 days, and the archive has thousands of hours of programming.