Complex sentence: Antanas Smetona and Augustinas Voldemaras had already taken power in a "coup d'état" in 1926; both Estonia and Latvia followed the example in 1934.
Split into simpler sentences: Antanas Smetona and Augustinas Voldemaras took power by a "coup d'état" already in 1926. Both Estonia and Latvia followed the example in 1934.