Complex sentence: Homas are an important religious practice in Hinduism, where they part of most of the Sanskar ceremonies, Buddhism (particularly the Tibetan and Japanese Vajrayana traditions) and Jainism.
Split into simpler sentences: Homas are an important religious practice in Hinduism, where they part of most of the Sanskar ceremonies. They are also prevalent in Buddhism (particularly the Tibetan and Japanese Vajrayana traditions) and Jainism.