Complex sentence: Teams underwent administrative and technical checks in Buenos Aires between December 31 and January 2, and afterward 217 motorcycles, 25 all-terrain vehicle, 177 cars, and 81 trucks driven by a total of 837 people were approved to start.
Split into simpler sentences: Teams underwent administrative and technical checks in Buenos Aires between December 31 and January 2. Afterwards, 217 motorcycles, 25 all-terrain vehicle, 177 cars, and 81 trucks driven by a total of 837 people were approved to start.