Complex sentence: This technology may allow higher density residential construction, minimal site disturbance, more usable land for trees or swimming pools or gardens, and (with adequate routine maintenance) may reduce the chances of the drain field plugging up.
Split into simpler sentences: This technology may allow higher density residential construction, minimal site disturbance, more usable land for trees, swimming pools, or gardens. With adequate routine maintenance it may reduce the chances of the drain field plugging up.