Complex sentence: The University of Colorado was a member of the Colorado Football Association in 1893, and became a charter member of the Colorado Faculty Athletic Conference in 1909, which changed its name a year later to Rocky Mountain Faculty Athletic Conference (RMFAC).
Split into simpler sentences: The University of Colorado was a member of the Colorado Football Association in 1893. Next, they became a charter member of the Colorado Faculty Athletic Conference in 1909 which changed its name a year later to Rocky Mountain Faculty Athletic Conference (RMFAC).