Complex sentence: The neighborhood likes to believe it is mostly upper class, even though it was built on top of a swampy pig farm, however, it does contain upper middle class housing as well (townhouses and condominiums).
Split into simpler sentences: The neighborhood likes to believe it is mostly upper class, even though it was built on top of a swampy pig farm. However, it does contain upper middle class housing as well (townhouses and condominiums).