Complex sentence: Coster-Waldau starred in the 2013 horror film "Mama" alongside Jessica Chastain and played Sykes, a battle-hardened, intelligent and highly athletic military weapons expert in the science fiction action thriller film "Oblivion".
Split into simpler sentences: Coster-Waldau starred in the 2013 horror film "Mama" alongside Jessica Chastain. He went on to play Sykes, a military weapons expert in the science fiction action thriller film "Oblivion".