Final answer:
Agreeing with the statement, it is true that Cistercian architecture features simple vaulted naves, reflecting the order's emphasis on austerity, which contrasts with the complexity of Gothic architecture.
Step-by-step explanation:
The assertion that Cistercian architecture has simple vaulted naves is true. The Cistercian order emphasized austerity and simplicity in their monastic practices, which was also reflected in their architectural style. This was relatively different from contemporaneous Gothic architecture, which tended to be much more complex and ornate. In Cistercian churches, the focus was on unadorned walls and minimalistic design, often resulting in naves covered with simple barrel vaults.
An example of Romanesque architecture, which often influenced Cistercian styles, can be found in churches like the Sant Climent de Taull, which had a basilica plan with wooden roofs that were susceptible to fire, later replaced by masonry vaulted ceilings for safety and durability. Furthermore, in typical Romanesque churches, the aisles might be vaulted while the nave retained a simpler, wooden roof.