Complex sentence: He was Arsenal's first choice golkeeper following the departure of Jens Lehmann, although after Arsenal's 3--2 defeat to West Bromwich Albion in 2010, Wojciech Szczęsny and Łukasz Fabiański were preferred, leaving Almunia as Arsenal's third-choice goalkeeper.
Split into simpler sentences: He was Arsenal's first choice golkeeper following the departure of Jens Lehmann. Since Arsenal's 3--2 defeat to West Bromwich Albion in 2010, Wojciech Szczęsny and Łukasz Fabiański have been preferred goalkeeper's, leaving Almunia as Arsenal's third-choice goalkeeper.