Complex sentence: He starred in the television documentary'(2010--2012) and in 2014 won the Best Actor award at the 2014 Cannes Film Festival for portraying J. M. W. Turner in Mike Leigh's biographical film "Mr. Turner".
Split into simpler sentences: He starred in the television documentary'(2010--2012). In 2014, he won the Best Actor award at the 2014 Cannes Film Festival for portraying J. M. W. Turner in Mike Leigh's biographical film "Mr. Turner".