Complex sentence: In 2015, Pope and Crowe shifted focus on to a portion of SpaceVenture that didn't require as much writing due to Murphy needing some time away from the project for personal reasons.
Split into simpler sentences: In 2015, Pope and Crowe shifted focus on to a portion of SpaceVenture that didn't require as much writing. This was due to Murphy needing some time away from the project for personal reasons.