Complex sentence: The first one was used from the independence of Bahrain in 1971 until 2002, and the other was used since the country's ruler Hamad ibn Isa Al Khalifah declared himself as a king and his country a kingdom until the present.
Split into simpler sentences: The first one anthem was used from the independence of Bahrain in 1971 until 2002. The second version was used since the country's ruler Hamad ibn Isa Al Khalifah declared himself as a king, and his country a kingdom, until the present.