Complex sentence: Anne was betrothed to her cousin Louis when she was ten years old; the marriage contract was signed at Montbrison on 4 July 1368 and the pair married in person at Ardes in January 1370.
Split into simpler sentences: Anne was betrothed to her cousin Louis when she was ten years old. The marriage contract was signed at Montbrison on 4 July 1368 and the pair were married in person at Ardes in January 1370.