Complex sentence: Clarke was selected for the Great Britain Students team which won the World University Rugby Sevens Championships in Brazil.THe success in South America earned him a call-up to the England Sevens squad which competed in the 2014 Sevens Grand Prix Series.
Split into simpler sentences: Clarke was selected for the Great Britain Students team which won the World University Rugby Sevens Championships in Brazil. The success in South America earned him a call-up to the England Sevens squad which competed in the 2014 Sevens Grand Prix Series.