Complex sentence: The movie cast Canadian actors in the primary roles and numerous Inuit, including the lead actress Piugattuk, who was selected after the casting director reviewed hundreds of young women, many of whom were, like Piugattuk, non-actors.
Split into simpler sentences: The movie cast Canadian actors in the primary roles and numerous Inuit, including the lead actress Piugattuk. She was selected after the casting director reviewed hundreds of young women, many of whom were, like Piugattuk, non-actors.