Complex sentence: The first historical reference to Coufunga is as a royal court in the year 1011, although the extant "St. Georgskapelle" (St George's Chapel) is believed to date from the 10th century.
Split into simpler sentences: The first historical reference to Coufunga is in the year 1011, when it was in use as a royal court. However, the extant "St. Georgskapelle" (St George's Chapel) is believed to date from the 10th century.