Complex sentence: However, in early August, the contents of the building were stolen by some republicans, including paintings by Thomas Gainsborough, William Beechey and Conrod, as well as silver, furniture, wall hangings, and mantlepieces.
Split into simpler sentences: However, in early August, the contents of the building were stolen by the Republicans. Among the items stolen were paintings by Thomas Gainsborough, William Beechey and Conrod, as well as silver, furniture, wall hangings, and mantlepieces.