Complex sentence: It took two years to create the work, which can be interpreted in several ways, the stone is risen from the depths of the earth (igneous rock), it's also a bath tub where one drops down in water.
Split into simpler sentences: It took two years to create the work, which can be interpreted in several ways. The stone is risen from the depths of the earth (igneous rock), it's also a bath tub where one drops down in water.