Complex sentence: He signed on to play for his beloved St. George Dragons, his local rugby league club for the start of the 1958 season after his immense talents were noticed while he was playing for junior club Renown United.
Split into simpler sentences: He signed on to play for the St. George Dragons, his local rugby league club for the start of the 1958 season. His talents had been noticed while he was playing for junior club Renown United.