Complex sentence: He removed 20 pages of around 89 pages of the script then written, and used it as the pilot for the series, and what was to have been the end of the first act became the finale of the first season.
Split into simpler sentences: He removed 20 pages of around 89 pages of the script then written, and used it as the pilot for the series. The end of the first act became the finale of the first season.