Complex sentence: Kaufman agreed to appear as Latka Gravas in fourteen episodes per season, approximately half of the entire series, if Tony Clifton was also allowed to guest star in the series.
Split into simpler sentences: Kaufman agreed to appear as Latka Gravas in fourteen episodes per season, approximately half of the entire series. One of Kaufman's conditions was that Tony Clifton also be allowed to guest star in the series.