Complex sentence: They first conduct a round of selection from the regions and then post all the elimination rounds for the final contestants, the group goes under vigorous training which includes, physical fitness, grooming, catwalk, diction, speech and so on.
Split into simpler sentences: They first conduct a round of selection from the regions and then post all the elimination rounds for the final contestants. The group undergoes vigorous training including physical fitness, grooming, catwalk, diction, speech and so on.