Complex sentence: He returned to San Juan at the end of the deliberations, were he served as acting governor replacing José Ignacio de la Roza; as interim governor he took a determined and tough line against the dissidents.
Split into simpler sentences: He returned to San Juan at the end of the deliberations, were he served as acting governor replacing José Ignacio de la Roza. As interim governor he took a determined and tough line against the dissidents.