Complex sentence: In 2011, Lawler attempted to break the long standing record time in the Devizes to Westminster International Canoe Marathon with current world champion Ben Brown, however they were unsuccessful and retired from the race due to injury and poor flow on the Thames.
Split into simpler sentences: In 2011, Lawler attempted to break the long-standing record time in the Devizes to Westminster International Canoe Marathon with current world champion Ben Brown. However, they were unsuccessful and retired from the race due to injury and poor flow on the Thames.