Complex sentence: Temples have been a significant part of Mormonism since its inception, and many Latter Day Saint sects have built temples, the most prolific being The Church of Jesus Christ of Latter-day Saints.
Split into simpler sentences: Temples have been a significant part of Mormonism since its inception, and many Latter Day Saint sects have built temples. See, e.g., Temples of the Church of Jesus Christ of Latter-day Saints.