Complex sentence: He led the National Party's return to power in 1860 and made attempts to unite the country's political factions, but he was overthrown by army commander Venancio Flores, a member of the rival Colorado Party, after four years in power.
Split into simpler sentences: He led the National Party's return to power in 1860 and made attempts to unite the country's political factions. However, Berro was overthrown by army commander Venancio Flores, a member of the rival Colorado Party, after four years in power.