Simplify the following text for a Grade 5 native English-speaking person.
Original: Although his performance lagged behind his 1999 performance , he amassed a league-high 36 touchdown passes and 4,830 passing yards , third all-time behind only Dan Marino and Drew Brees .
Simplified: He had a league-high 36 touchdown passes and 4,830 passing yards with a career-high completion rate of 68.7 % of his passes .