Complex sentence: Kallis injured his neck during the 2010 Champions League Twenty20 playing for the Royal Challengers Bangalore he missed the Twenty20 and ODI series against Zimbabwe but returned for the ODI series against Pakistan in which he scored 66 before having to retire hurt with cramps.
Split into simpler sentences: Kallis injured his neck during the 2010 Champions League Twenty20 playing for the Royal Challengers Bangalore and he missed the Twenty20 and ODI series against Zimbabwe. But he returned for the ODI series against Pakistan in which he scored 66 before having to retire hurt with cramps.