Complex sentence: Decay is a villainous professional wrestling tag team in the Total Nonstop Action Wrestling promotion, consisting of Abyss, Crazzy Steve and Rosemary where they are the former TNA World Tag Team Champions.
Split into simpler sentences: Decay is a villainous professional wrestling stable in the Total Nonstop Action Wrestling promotion, consisting of Abyss, Crazzy Steve and Rosemary. The tag team of Abyss and Crazzy Steve are former TNA World Tag Team Champions.