Detailed Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Q: Passage: Mackenzie left in 1844, and although he had achieved a great deal, the weakness of the St Kildans' dependence on external authority was exposed in 1865 with the arrival of Rev. John Mackay. Despite their fondness for Mackenzie, who stayed in the Church of Scotland, the St Kildans "came out" in favour of the new Free Church during the Disruption. Mackay, the new Free Church minister, placed an uncommon emphasis on religious observance. He introduced a routine of three two-to-three-hour services on Sunday at which attendance was effectively compulsory. One visitor noted in 1875 that: "The Sabbath was a day of intolerable gloom. At the clink of the bell the whole flock hurry to Church with sorrowful looks and eyes bent upon the ground. It is considered sinful to look to the right or to the left." 
Time spent in religious gatherings interfered seriously with the practical routines of the island. Old ladies and children who made noise in church were lectured at length and warned of dire punishments in the afterworld. During a period of food shortages on the island, a relief vessel arrived on a Saturday, but the minister said that the islanders had to spend the day preparing for church on the Sabbath, and it was Monday before supplies were landed. Children were forbidden to play games and required to carry a Bible wherever they went. Mackay remained minister on St Kilda for 24 years.
A:
Who's departure eventually led to dependence on a new external authority in 1865?