Complex sentence: He returned to play the lead role in Pavel Lungin's religious film "Ostrov", which closed the 2006 Venice Film Festival and was praised by Alexis II, Patriarch of Moscow.
Split into simpler sentences: He returned to play the lead role in Pavel Lungin's religious film "Ostrov", which closed the 2006 Venice Film Festival. His acting in the film was praised by Alexis II, Patriarch of Moscow.