Complex sentence: He had the option to sign a further year at Everton but decided to sign for Southampton after other interest Southampton on a two-and-a-half-year contract on 2 January 2009.
Split into simpler sentences: He had the option to sign a further year at Everton but decided to sign for Southampton after other interest. He signed for Southampton on a two-and-a-half-year contract on 2 January 2009.