Complex sentence: Subsequently, on 20 July 2007, Helguera signed for Valencia on a three-year contract--upon joining, he stated that he had wanted to come to Valencia for a "long time" and was "delighted" to arrive at the club.
Split into simpler sentences: Subsequently, on 20 July 2007, Helguera signed for Valencia on a three-year contract. Upon joining, he stated that he had wanted to come to Valencia for a "long time" and was "delighted" to arrive at the club.