Complex sentence: Oleksandr Turchynov was the only acting president in Ukraine's modern history, unlike in the US where the vice president inherits all powers of the presidency the powers of an acting president in Ukraine are severely limited.
Split into simpler sentences: Oleksandr Turchynov was the only acting president in Ukraine's modern history. Unlike in the US, in which the vice president inherits all powers of the presidency, the powers of an acting president in Ukraine are severely limited.