Complex sentence: Parishioners borrowed a bulldozer from the John F. Casey Company in Aspinwall, and a steam shovel from the Burrell Construction and Supply Company of New Kensington; and, they dug the foundation for a two-level building.
Split into simpler sentences: Parishioners borrowed a bulldozer from the John F. Casey Company in Aspinwall, and a steam shovel from the Burrell Construction and Supply Company of New Kensington. With these tools, they dug the foundation for a two-level building.