Complex sentence: Although never a top headlining act, Ali performed for heads of state including Tsar Nicholas II of Russia and had a dedicated following on the vaudeville circuit in the United States, even having Judy Garland proclaim him her favorite vaudevillian.
Split into simpler sentences: Although never a top headlining act, Ali had a dedicated following on the vaudeville circuit in the United States. He performed for heads of state including Tsar Nicholas II of Russia and Judy Garland named him her favorite vaudevillian.