Complex sentence: Casper only caught a total of nine passes his first two seasons, but was a top-ten receiver in 1976, in which he had 53 catches for 691 yards and 10 touchdowns.
Split into simpler sentences: Casper only caught a total of 9 passes his first two seasons, but was a top 10 receiver in 1976. That season he had 53 catches for 691 yards and 10 touchdowns.