Complex sentence: He designed the building holistically, each element harmonizing with the others and was therefore also responsible for the interior decoration, such as statues, paintings, furniture, chandeliers, and numerous other elements.
Split into simpler sentences: He designed the building holistically, aiming to have each element harmonizing with all the others. He was therefore also responsible for the interior decoration, such as statues, paintings, furniture, chandeliers, and numerous other elements.