Complex sentence: The Brahmo Samaj was based on restoring certain religious concepts of ancient Vedic texts, whereas the Prarthana Samaj were followers of the great religious tradition of Maratha saints like Namdev, Tukaram and Ramdas, the guru of Shivaji.
Split into simpler sentences: The Brahmo Samaj was based on restoring certain religious concepts of ancient Vedic texts. In contrast, the Prarthana Samaj were followers of the great religious tradition of Maratha saints like Namdev, Tukaram and Ramdas, the guru of Shivaji.