Zen Sect
noun
The zen religion is a part of Buddhism. It is the Zen Sect of Buddhism.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
その禅宗に関する映画は、この映画館で上映中です。
The movie about the Zen sect of Japanese Buddhism is playing at this theater.