Complex sentence: Flynn is one of many players to be produced by the Crewe Alexandra production line, first joining the club at the young age of nine before making his way up the ranks at Crewe's academy playing as a defender.
Split into simpler sentences: Flynn is one of many players to be produced by the Crewe Alexandra production line. He first joined the club at the early age of nine, before making his way up the ranks at Crewe's academy, playing as a defender.