Complex sentence: Boise State again went 6--1 in conference in 1981, and tied for first with Idaho State in the Big Sky; both co-champions were invited to the expanded eight-team I-AA playoffs.
Split into simpler sentences: Boise State again went 6--1 in conference in 1981, and tied for first with Idaho State in the Big Sky. Both co-champions were invited to the expanded eight-team I-AA playoffs.