Complex sentence: He had previously won promotion to the Premiership twice with West Bromwich Albion, having taken over at a time when they were on the verge of relegation to League One, and it was hoped that he could achieve the same success with Forest.
Split into simpler sentences: He had previously won promotion to the Premiership twice with West Bromwich Albion, having taken over at a time when they were on the verge of relegation to League One. It was hoped that he could achieve the same success with Forest.