Complex sentence: He is a celebrated Naive painter, a member of the Union of bulgarian Artists, and was awarded the The Order of Cyril and Methodius 1st class--the highest prize for art and culture in Bulgaria.
Split into simpler sentences: He is a celebrated Naive painter, a member of the Union of bulgarian Artists. He holds The Order of Cyril and Methodius 1st class--the highest prize for art and culture in Bulgaria.