Given the task definition and input, reply with output. In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

He was the world heavyweight champion from 1937 to 1949 .

He reigned as the world heavyweight champion from 1937 to 1949 , and is considered to be one of the greatest heavyweight boxers of all time .