Complex sentence: At various times, Trujillo allowed other political parties to coexist, however, this was done only to impress foreign observers that democratization was progressing, and to allow Trujillo to monitor opponents.
Split into simpler sentences: At various times, Trujillo allowed other political parties to coexist. However, this was done only to impress foreign observers that democratization was progressing, and to allow Trujillo to monitor opponents.