Complex sentence: That, coupled with increasing competition for acquisition targets, caused Riley to essentially abandon the northeastern region, who literally began hunting for prey in the northwestern U.S. Riley found a target-rich environment in rural and underserved areas.
Split into simpler sentences: That, coupled with increasing competition for acquisition targets, caused Riley to essentially abandon the northeastern region. He then began hunting for prey in the northwestern U.S. Riley found a target-rich environment in rural and underserved areas.