Complex sentence: Early in his career he, along with Graham Thorpe, was heralded as a brilliant prospect for England, but as his record suggests, while Gallian may have had the talent to play Test cricket, he apparently lacked the temperament.
Split into simpler sentences: Early in his career he along with Graham Thorpe was heralded as a brilliant prospect for England. But as his record suggests, Gallian may have had the talent to play Test cricket but he certainly lacked the temperament.