Simplify the following text for a Grade 8 native English-speaking person.
Original: Originally credited in films as Creighton Chaney , he was first credited as `` Lon Chaney , Jr. '' in 1935 .
Simplified: When he began making movies in 1932 he was known by his original name Creighton Chaney , but starting in 1935 he used the name `` Lon Chaney , Jr. ''