Complex sentence: He switched to rugby league in 2008 when he joined Valley Cougars by 2010 he had represented Wales with the Wales Dragonhearts team, but the season ended in disaster when he suffered knee ligament damage which would keep him out until 2012.
Split into simpler sentences: He switched to rugby league in 2008 when he joined Valley Cougars. By 2010 he had represented Wales with the Wales Dragonhearts team, but the season ended in disaster when he suffered knee ligament damage which would keep him out until 2012.