Complex sentence: Each weekend eliminates three quarters of the teams, from a round of 64, to a "Sweet Sixteen", and for the last weekend of the Tournament a Final Four; the Final Four is usually played during the first weekend of April.
Split into simpler sentences: Each weekend eliminates three quarters of the teams, from a round of 64, to a "Sweet Sixteen", and for the last weekend of the Tournament a Final Four. The Final Four is usually played during the first weekend of April.