Complex sentence: It was founded "circa" 1793 by Samuel Davis, who opened a post office in 1802 and called it Davistown; it was also known as Georgetown for tavern keeper George Nichols.
Split into simpler sentences: It was founded about 1793 by Samuel Davis, who opened a post office in 1802 and called it Davistown. Later it was also known as Georgetown for tavern keeper George Nichols.