Complex sentence: His best season as a pro came in 1999 with the Rams when he tallied a career high 17 sacks which led the NFL and was the highest sack total by a Ram since Jack Youngblood collected 18 sacks in 1979.
Split into simpler sentences: His best season as a pro came in 1999 with the Rams when he tallied a career high 17 sacks. His 17 sacks led the NFL and it was the highest sack total by a Ram since Jack Youngblood collected 18 sacks in 1979.