Complex sentence: Scholars regard Hinduism as a fusion or synthesis of various Indian cultures and traditions,;; with diverse roots and no founder, which started to develop between 500 BCE and 300 CE, after the Vedic times.
Split into simpler sentences: Scholars regard Hinduism as a fusion or synthesis of various Indian cultures and traditions,;; with diverse roots and no founder. This "synthesis" started to develop between 500 BCE and 300 CE, after the Vedic times.