Simplify the following text for a Grade 6 native English-speaking person.
Original: In his three seasons with the Millers , he appeared in 118 games , recording 33 shutouts with a 1.37 goals against average ( average of goals surrendered in a span of sixty minutes ) .
Simplified: During that time , he appeared in 118 games , making 33 shutouts . He had a 1.37 goals-against average , which is an average of goals surrendered in a span of sixty minutes ) .