Complex sentence: On each stage, each team was awarded a time based on the cumulative time of its top three riders; the times for each stage were then added together and the team with the lowest total time was the leader of the team classification.
Split into simpler sentences: On each stage, each team is awarded a time based on the cumulative time of its top three riders. The times for each stage are then added together and the team with the lowest total time is the leader of the team classification.