Complex sentence: He participated in the Wrestlemania IV Battle Royal, but was outside the ring the whole time, according to Steele, he suffered a knee injury at a house show prior to the event, which was the reason he didn't get in the ring.
Split into simpler sentences: He participated in the Wrestlemania IV Battle Royal, but was outside of the ring the whole time. According to Steele, he suffered a knee injury at a house show prior to the event, which was the reason he didn't get in the ring.