Complex sentence: He is best known for his performances in Extreme Championship Wrestling and World Wrestling Federation/Entertainment under the ring name Spike Dudley and in Total Nonstop Action Wrestling under the ring name Brother Runt.
Split into simpler sentences: He is best known for his tenure with Extreme Championship Wrestling and World Wrestling Federation/Entertainment under the ring name Spike Dudley. He also wrestled in Total Nonstop Action Wrestling under the ring name Brother Runt.