Complex sentence: Ernest "Ernie" Banks (January 31,1931--January 23,2015), nicknamed "Mr. Cub" and "Mr. Sunshine", was a American Major League Baseball (MLB) shortstop and first baseman for 19 seasons, 1953 through 1971.
Split into simpler sentences: Ernest "Ernie" Banks (January 31,1931--January 23,2015), nicknamed "Mr. Cub" and "Mr. Sunshine", was an American professional baseball player. He was a Major League Baseball (MLB) shortstop and first baseman for 19 seasons, 1953 through 1971.