Complex sentence: Interlocking paving stones are installed over a compacted stone sub-base and a leveling bed of sand, concrete paving stones can be used for walkways, patios, pool decks and driveways and airport or loading docks.
Split into simpler sentences: Interlocking paving stones are installed over a compacted stone sub-base and a leveling bed of sand. Concrete paving stones can be used for walkways, patios, pool decks and driveways and airport or loading docks.