Complex sentence: This "Pax Romana" was instrumental in the "standardization of language, customs, architecture, housing and technology", although Jerome and later authors evidence that Illyrian and other native tongues survived up until the late 4th century or even further.
Split into simpler sentences: This "Pax Romana" was instrumental in the "standardization of language, customs, architecture, housing and technology". Even so St Jerome and later authors evidence that Illyrian and other native tongues survived up until the late 4th century or even further.