Complex sentence: Feller was the first player to get a franchise to agree to a share of game receipts when Feller was the starting pitcher for Indians' games and earliest player to incorporate himself (as Ro-Fel, Inc.).
Split into simpler sentences: Feller was the first player to get a franchise to agree to a share of game receipts when he was the starting pitcher for Indians' games. He was also the earliest player to incorporate himself (as Ro-Fel, Inc.).