Complex sentence: Iñárritu signed on to direct in August 2011, and in April 2014, after several delays due to other projects, Iñárritu confirmed that he was beginning work on "The Revenant" and that DiCaprio would play the lead role.
Split into simpler sentences: Iñárritu signed on to direct in August 2011, and in April 2014. After several delays due to other projects, Iñárritu confirmed that he was beginning work on "The Revenant" and that DiCaprio would play the lead role.