Complex sentence: The entry into the Tag Heuer Pit Stop Challenge on Miller Lite Carb Day consisted of military veterans and first responders, coming together under the tutelage of PitFit Training for ten days to train them in being a professional pit crew.
Split into simpler sentences: The entry into the Tag Heuer Pit Stop Challenge on Miller Lite Carb Day will be made up of military veterans and first responders. They will come together under the tutelage of PitFit Training for ten days to train them in being a professional pit crew.