Complex sentence: Members of each team compete for who can grow the heavier taro or larger chickens; the climax comes with the weigh-off between the competitors, concluding a day of good-natured rivalry and fun.
Split into simpler sentences: Members of each team compete for who can grow the heavier taro or larger chickens. The competition come to a climax with the weigh-off between the competitors, which is a day of good nature rivalry and fun.