Complex sentence: He later decided to join Manchester City, who took the unprecedented step to virtually guarantee Dowe a professional contract, even though he was still at school and recovering from fractured spine at the time, after getting injured previously in an Everton reserve game.
Split into simpler sentences: He later decided to join Manchester City, who took the unprecedented step to virtually guarantee Dowe a professional contract, even though he was still at school. Something that was even more astounding, was that he had a fractured spine at the time, after getting injured previously in an Everton reserve game.