Complex sentence: Republished as The Jubilee is the year at the end of seven cycles of Shmita, therefore the world will exist for 49,000 years, or seven 7000-year cycles.
Split into simpler sentences: Republished as The Jubilee is the year at the end of seven cycles of Shmita. Because there are 7 such cycles the world will exist for 49,000 years, or seven 7000-year cycles.