Complex sentence: There are no special rules about where one may find fossils, and you can find fossils in many places where sedimentary rocks are exposed, such as clays, shales, limestones, and sandstones.
Split into simpler sentences: There are no special rules about where one may find fossils. You can find fossils in many places where sedimentary rocks are exposed, such as clays, shales, limestones, and sandstones.