Complex sentence: He was an U- 21 League winner with Tigers in 2002--03 and A League winner in 2004--05 and 2005--06, having made his first-team debut as an 18-year-old against Worcester Warriors in January 2002.
Split into simpler sentences: He was an U- 21 League winner with the Tigers in 2002--03. He made his first-team debut as an 18-year-old against Worcester Warriors in January 2002.