Complex sentence: Mily Alexeyevich Balakirev ("Milij Alekseevič Balakirev",) (2 January 1837 (O.S.21 December 1836) --) was a Russian pianist, conductor and composer known today primarily for his work promoting musical nationalism in Russia.
Split into simpler sentences: Mily Alexeyevich Balakirev ("Milij Alekseevič Balakirev",) (2 January 1837 (O.S.21 December 1836) --) was a Russian pianist, conductor and composer. He is known today primarily for his work promoting musical nationalism in Russia.