Complex sentence: He scored his first official goal in professional football on 9 September 2007 against Cesena, while only two months later, on 9 November, after having scored 8 goals in 14 matches and helped the Tuscan team to reach the top of the table.
Split into simpler sentences: He scored his first official goal in professional football on 9 September 2007 against Cesena. Two months later, on 9 November, with 8 goals in 14 matches under his belt, he helped the Tuscan team to reach the top of the table.