Complex sentence: Initially having played as a reserve batsman in the Indian team, he soon established himself as a regular in the ODI middle-order and was part of the squad that won the 2011 World Cup.
Split into simpler sentences: Initially having played as a reserve batsman in the Indian team, he soon established himself as a regular in the middle-order in ODIs. He was part of the Indian squad that won the 2011 World Cup.