Complex sentence: On September 3,2005, the BYU Football team instituted the new tradition, and a little over a year later, on November 18,2006, the Cougars became undefeated (in conference play) Mountain West Conference champions.
Split into simpler sentences: On September 3,2005, the BYU Football team instituted the new tradition. A little over a year later, on November 18,2006, the Cougars became undefeated (in conference play) Mountain West Conference champions.