Complex sentence: Nottingham Forest Football Club is a professional football club in Nottingham, England, which plays in the Championship, the second tier of English football, having been promoted from League One in 2008.
Split into simpler sentences: Nottingham Forest Football Club is a professional association football club based in Nottingham, England. The team play in the Championship, the second tier of English football, having been there since promotion from League One in 2008.