Simplify the following text for a Grade 14 native English-speaking person.
Original: Later , Castro used the same facility to imprison counterrevolutionaries and dissidents , such as Huber Matos ( once a comandante of rebel troops supporting the Cuban Revolution but later came into conflict with Cuban government ) , who claims to have been tortured there , and Armando F. Valladares .
Simplified: After the Cuban Revolution , the same facility was used to imprison counterrevolutionaries , and people allegedly otherwise opposing the revolution . Huber Matos ( a comandante in the revolutionary army who attempted to resign ) and Armando Valladares were also imprisoned there .