Complex sentence: She did her undergraduate studies at Reed College, which her grandfather had founded, graduating in 1917, taught at Mills College from 1917 to 1918, and then worked as an assistant to Yale economist Irving Fisher from 1918 to 1920.
Split into simpler sentences: She did her undergraduate studies at Reed College, which her grandfather had founded, graduating in 1917. She taught at Mills College from 1917 to 1918, and then worked as an assistant to Yale economist Irving Fisher from 1918 to 1920.