Complex sentence: Charles was interred in the Church of the Annunciation of Our Lady, in the Franciscan Kostanjevica Monastery (now in Nova Gorica, Slovenia), where his remains lie in a crypt with those of his family.
Split into simpler sentences: Charles was interred in the Church of the Annunciation of Our Lady, in the Franciscan Kostanjevica Monastery (now in Nova Gorica, Slovenia). His remains lie in a crypt with those of his family.