Complex sentence: Martha Stewart "Mittie" Bulloch (July 8,1835--February 14,1884) was an American socialite, mother of US President Theodore Roosevelt, and the paternal grandmother of Eleanor Roosevelt.
Split into simpler sentences: Martha Stewart "Mittie" Bulloch (July 8,1835--February 14,1884) was an American socialite. She was also the mother of US President Theodore Roosevelt and the paternal grandmother of Eleanor Roosevelt.