Complex sentence: The Summer Lake community includes the well preserved nineteenth-century Harris school, a one-room school house built in 1890 by the Harris family, who were among the first pioneer families to settle in the Summer Lake area.
Split into simpler sentences: The Summer Lake community includes the well preserved nineteenth-century Harris school. A one-room school house built in 1890 by the Harris family, who were among the first pioneer families to settle in the Summer Lake area.