Complex sentence: The deadline of the competition, which initially attracted entries from over 30 teams from 17 countries, was 31 March 2018 and it had various prizes, including a main prize of US $20 million.
Split into simpler sentences: The deadline of the competition, which initially attracted entries from over 30 teams from 17 countries, is 31 March 2018. There are various prizes, including a main prize of US $20 million.