Complex sentence: The Church of St. Thomas in Rateče, Kranjska Gora, Slovenia, is one of the oldest churches in the upper Sava Valley, confirmed by written documents and excavations as well as the church's original furnishings.
Split into simpler sentences: The Church of St. Thomas in Rateče, Kranjska Gora, Slovenia, is one of the oldest churches in the upper Sava Valley. This is confirmed by written documents and excavations as well as the church's original furnishings.