Complex sentence: It has been the official anthem of the country since 1984, when Upper Volta became known as "Burkina Faso", even after Sankara was murdered in a coup, the leader of which remains in power.
Split into simpler sentences: It has been the official anthem of the country since 1984, when Upper Volta became known as "Burkina Faso". It remains even after Sankara was murdered in a coup, the leader of which remains in power.