Complex sentence: The body of Jean Parisot de la Valette was entombed there until the construction of St. John's Co-Cathedral, commissioned in 1572 by Grand Master Jean de la Cassière as the conventual church of the Knights of Malta.
Split into simpler sentences: The body of Jean Parisot de la Valette was entombed there until the construction of St. John's Co-Cathedral. It was commissioned in 1572 by Grand Master Jean de la Cassière as the conventual church of the Knights of Malta.