Complex sentence: Documented biota now includes phosphatized microfossils of algae, multicellular thallophytes (seaweeds), acritarchs, and cyanophytes, besides adult sponges and adult cnidarians, which may include early forms of tabulate corals.
Split into simpler sentences: Documented biota now includes phosphatized microfossils of algae, multicellular thallophytes (seaweeds), acritarchs, and cyanophytes. Besides adult sponges and adult cnidarians, which may include early forms of tabulate corals.