Complex sentence: Betancourt had denounced the dictatorship of Dominican Republic's Rafael Trujillo; the fascist-like Trujillo had developed an obsessive personal hatred of Betancourt and supported plots of Venezuelan exiles to overthrow him.
Split into simpler sentences: Betancourt had denounced the dictatorship of Dominican Republic's Rafael Trujillo. In turn, Trujillo had developed an obsessive personal hatred of Betancourt and supported plots of Venezuelan exiles to overthrow him.