Complex sentence: Certain local gods mentioned within the text allow the Liber Linteus's place of production to be narrowed to a small area in the southeast of Tuscany near Lake Trasimeno, where four major Etruscan cities were located: modern day Arezzo, Perugia, Chiusi and Cortona.
Split into simpler sentences: Certain local gods mentioned within the text allow the Liber Linteus's place of production to narrowed to a small area in the southeast of Tuscany near Lake Trasimeno. Four major Etruscan cities were in that area: modern day Arezzo, Perugia, Chiusi and Cortona.