Complex sentence: Despite that, she managed to influence her husband to involve himself more directly in Spanish colonial politics, leading to the taking of Montevideo in 1817 and the annexation of Cisplatina Province in 1821.
Split into simpler sentences: Despite that, she managed to influence her husband to involve himself more directly in Spanish colonial politics. These efforts led to the capture of Montevideo in 1817 and the annexation of Cisplatina Province in 1821.