Answered January 12th, 2020

George Brett had a batting average of .390 when slugging .600 or better with an on-base percentage of .400 or above and when making 502+ plate appearances in 1980.

.300 avg,.400 obp,.600 slg by a player in a season from 1980 to 1989 with 502 pa, list by most recent
Interpreted as:
.300 or higher avg,.400 or higher obp,.600 or higher slg by a player in a season from 1980 to 1989 with 502 or more pa, list by most recent

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