Complex sentence: Michael I (born 25 October 1921) reigned as King of Romania from 20 July 1927 to 8 June 1930 and again from 6 September 1940 to 30 December 1947.
Split into simpler sentences: Michael I (born 25 October 1921) is a former King of Romania. He reigned from 20 July 1927 to 8 June 1930 and again from 6 September 1940 to 30 December 1947.