Complex sentence: Latter Day Saint historical sources indicate that, as early as 1832, Mormon missionaries were laboring successfully to make converts among Maine's followers of polygamist religious leader Jacob Cochran, who went into hiding in 1830 to escape imprisonment due to his practice of polygamy.
Split into simpler sentences: Latter Day Saint historical sources indicate that, as early as 1832, Mormon missionaries were laboring successfully to make converts among Maine's followers of polygamist religious leader Jacob Cochran. He went into hiding in 1830 to escape imprisonment due to his practice of polygamy.