Complex sentence: The biretta itself may have been a development of the Roman "pileus quadratus", a type of skullcap with superposed square and tump and a reinvention of this type of cap is known as the Bishop Andrewes cap.
Split into simpler sentences: The biretta itself may have been a development of the Roman "pileus quadratus", a type of skullcap with superposed square and tump. A reinvention of this type of cap is known as the Bishop Andrewes cap.