Original sentence: In Plovdiv (1867 – 1878), he contacted famous Bulgarian National Revival activists such as  Yoakim Gruev, Nayden Gerov and Dragan Manchov.While in the Krichim Monastery (1869 – 1873), he hid the founder of the Internal Revolutionary Organization, Vasil Levski, who at that time formed a revolutionary committee there
Edited sentence: In Plovdiv, he contacted famous Bulgarian National Revival activists such as  Yoakim Gruev, Nayden Gerov and Dragan Manchov.While in the Krichim Monastery, he hid the founder of the Internal Revolutionary Organization, Vasil Levski, who at that time formed a revolutionary committee there