Complex sentence: A 17 March 1991 referendum showed 76.4% of Soviet citizens voting to retain the Union, however Estonia, Latvia, Lithuania, Moldavia, Georgia, and Armenia did not participate.
Split into simpler sentences: A 17 March 1991 referendum showed 76.4% of Soviet citizens voting to retain the Union. However, Estonia, Latvia, Lithuania, Moldavia, Georgia, and Armenia did not participate.