Complex sentence: Emilia-Romagna was part of the Etruscan world and in following was passed on to the Gauls and then the Romans, who built the Aemilian Way, for which the region was named.
Split into simpler sentences: Emilia-Romagna was part of the Etruscan world and in following was passed on to the Gauls and then the Romans. The romans built the Aemilian Way, for which the region was named.