Simplify the following text for a Grade 11 native English-speaking person.
Original: An excellent athlete at various sports , Moore 's many records in billiards include winning the Michigan State Billiard Championship four times , placing second at the World Championship five times competing against the best in the world such as Willie Mosconi , Irving Crane and Luther Lassiter , winning the United States National Pocket Billiards Championship in 1958 , the National Invitation Pocket Billiards Championship in 1965 and the Legends of Pocket Billiards competition in 1984 .
Simplified: He came in second at the World Championship five times while playing the best in the world such as Willie Mosconi , Irving Crane and Luther Lassiter . He won the United States National Pocket Billiards Championship in 1958 , the National Invitation Pocket Billiards Championship in 1965 , and the Legends of Pocket Billiards competition in 1984 .