Original sentence: It was at this time, in the 1st century BC, that Romans started to widely use concrete (which was invented in the late 3rd century BC), a powerful cement derived from pozzolana which soon supplanted marble as the chief Roman building material and allowed for numerous daring architectural schemata.The Romans gradually subdued the other peoples on the Italian peninsula, including the Etruscans
Edited sentence: It was at this time, in the 1st century BC, that Romans started to widely use concrete (which was invented in the late 3rd century BC), a powerful cement derived from pozzolana which soon supplanted marble as the head Roman building material and allowed for numerous daring architectural schemata.The Romans gradually subdued the other people on the Italian peninsula, including the Etruscans