Complex sentence: It divided the year into four seasons of exactly 13 weeks each, and each such season consisted of two 30-day months followed by one 31-day month with the 31st day ending the season, so that Enoch's Year consisted of exactly 364 days.
Split into simpler sentences: It divided the year into four seasons of exactly 13 weeks each. Each such season consisted of two 30-day months followed by one 31-day month, with the 31st day ending the season, so that Enoch's Year consisted of exactly 364 days.