Complex sentence: The Nasty Boys reappeared in both parts of "Reunion" where, teamed with the Savage Land Mutates, they proved to be quite imposing to the X-Men whom Sinister had rendered powerless.
Split into simpler sentences: The Nasty Boys reappeared in both parts of "Reunion" where, teamed with the Savage Land Mutates. They proved to be quite imposing to the X-Men, whom Sinister had rendered powerless.