Original sentence: The first major leaguer whose number was retired was Gehrig, at a ceremony at Yankee Stadium on July 4, 1939, following his retirement due to amyotrophic lateral sclerosis, also known as Lou Gehrig's disease
Edited sentence: The first major leaguer whose number was retired was Gehrig, at a ceremony at Yankee Stadium on July 4, 1939, following his retirement due to amyotrophic lateral sclerosis, which became to be known popularly as Lou Gehrig's disease