Complex sentence: William Wallace Ross arrived here sometime in the 1860s and established a home site at a point which he called "Palmetto Point", where he established the first Holly Hill area post office at his home, which was called the Palmetto Post Office.
Split into simpler sentences: William Wallace Ross arrived here sometime in the 1860s and established a home site at a point which he called "Palmetto Point". There he established the first Holly Hill area post office at his home which was called the Palmetto Post Office.