Complex sentence: Some of the dialogue was improvised by the cast, especially in the interview segments; to convey the hostile response Munch's work often received during his lifetime, Watkins recruited Norwegians who genuinely disliked the paintings.
Split into simpler sentences: Some of the dialogue was improvised by the cast, especially in the interview segments. To convey the hostile response Munch's work often received during his lifetime, Watkins recruited Norwegians who genuinely disliked the paintings.