Complex sentence: It was developed during Paleozoic and Mesozoic eras with a sedimentary register comprehending rocks from Ordovician trough Cretaceous and spanning a time interval between 460 and 65 million years.
Split into simpler sentences: It was developed during Paleozoic and Mesozoic eras. Its sedimentary register comprehend rocks from Ordovician trough Cretaceous, spanning a time interval between 460 and 65 million years.