Complex sentence: In 1875, Takusaburō left Father Nikolai to study under the Ichigaya Academy of Confucian scholar Yasui Sokken, marking a radical conversion in Takusaburō's beliefs.
Split into simpler sentences: In 1875, Takusaburō left Father Nikolai to study under Confucian scholar Yasui Sokken of the Ichigaya Academy. This move marked a radical conversion in Takusaburō's beliefs.