You would take out the "and" behind of "then he made us lift weights" Like this:
Before (Non-revised): <span>Our football coach gathered us together and told us to run laps, and then he made us lift weights, and then he said we had to scrimmage.
After (Revised) : </span><span>Our football coach gathered us together and told us to run laps, then he made us lift weights, and then he said we had to scrimmage.</span>
