Complex sentence: Armenian architecture employs a form of concrete to produce a sturdy buildings, namely a mixture of lime mortar, broken tufa, and rocks around which formed a core around which cut slabs of tufa can be arranged in brickwork fashion.
Split into simpler sentences: Armenian architecture employs a form of concrete to produce sturdy buildings,. It is a mixture of lime mortar, broken tufa, and rocks around which formes a core against which thin slabs of tufa are arranged in brickwork fashion.