Complex sentence: The Air travel disruption after the 2010 Eyjafjallajökull eruption and the 2011 England riots were not revealed to the contestants before Series 5 and 8 began filming and the Arab Spring protests didn't even begin until after Series 6 and the first Celebrity series had finished filming.
Split into simpler sentences: The Air travel disruption after the 2010 Eyjafjallajökull eruption and the 2011 England riots were not revealed to the contestants before Series 5 and 8 began filming. The Arab Spring protests didn't even begin until after Series 6 and the first Celebrity series had finished filming.