Complex sentence: The group of young officers started to suspect that a Conservative restoration was under way, fears that seemed confirmed when Ladislao Errazuriz, head of the conservative party, suddenly presented his candidacy to the upcoming presidential elections.
Split into simpler sentences: The group of young officers started to suspect that a Conservative restoration was under way. The fears seemed confirmed when Ladislao Errazuriz, head of the conservative party, suddenly presented his candidacy to the upcoming presidential elections.