Complex sentence: The preservation of fossils in the Soom Shale is the opposite of that of normal fossilization, things that typically don't get preserved in the fossil record like soft tissue is preserved in exquisite detail.
Split into simpler sentences: The preservation of fossils in the Soom Shale is the opposite of that of normal fossil deposits. Things that in typical preservation conditions are not preserved in the fossil record like soft tissue are preserved in exquisite detail.