Complex sentence: In the geologic timescale, Berriasian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon that is comprehended between 145.5 million and 140.2 million years ago.
Split into simpler sentences: In the geologic timescale, Berriasian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon. It spanned between 145.5 million and 140.2 million years ago.