Complex sentence: The place appears on the USGS Arcata South map, but most of the hundreds of residents of this neighborhood are part of unincorporated Eureka, California, located entirely within the 95503 zipcode.
Split into simpler sentences: The place appears on the USGS Arcata South map. Residents of this neighborhood are part of unincorporated Eureka, California, located entirely within the 95503 zipcode.