Complex sentence: He was ordained a Lutheran priest in 1834 and became curate in Siuntio, then in Lohja, belonging since 1836 to Pietist revivalist movement led by Savonian farmer and lay preacher Paavo Ruotsalainen.
Split into simpler sentences: He was ordained a Lutheran priest in 1834 and became curate in Siuntio, then in Lohja. Dating from 1836, he had supported the Pietist revivalist movement led by Savonian farmer and lay preacher Paavo Ruotsalainen.