Complex sentence: After a spell as a youngster at Tottenham Hotspur, which spanned from the ages of 10-16, Young signed scholarship forms at Southampton at aged 16, and signed his first professional contract for Southampton in May 2012.
Split into simpler sentences: After a spell as a youngster at Tottenham Hotspur, which spanned from the ages of 10 to 16, Young signed scholarship forms at Southampton at aged 16. He signed his first professional contract for Southampton in May 2012.