Complex sentence: He is a left sided defender who is a good passer of the ball and can header reasonably well he has proved for San Luis he can pass well and was a hit with the fans but he is yet to make his breakthrough into the A team.
Split into simpler sentences: He is a left sided defender, who is a good passer of the ball and can head reasonably well. He has proved for San Luis he can pass well and was a hit with the fans, but he is yet to make his breakthrough into the A team.