Complex sentence: Born in Kettering, Northamptonshire, Kelly began his career playing for Football League Two side Rushden & Diamonds, and after impressing in the reserves, Marcus got this chance and made his debut in a 3-0 home defeat to A.F.C. Bournemouth on 27 March 2004.
Split into simpler sentences: Born in Kettering, Northamptonshire, Kelly began his career playing for Second Division side Rushden & Diamonds. After impressing in the reserve team, he made his debut in a 3--0 home defeat to Bournemouth on 27 March 2004.