Complex sentence: However, the arrivals of Hermann Hreidarsson and Sylvain Distin during the summer of 2007 cast his position as a first team regular into doubt and he was replaced as captain by Sol Campbell for the 2007/08 season.
Split into simpler sentences: However, the arrivals of Hermann Hreidarsson and Sylvain Distin during the summer of 2007 has cast his position as a first team regular into doubt. He has also been replaced as captain by Sol Campbell for the 2007/08 season.