Complex sentence: That first missionary, Joseph Newsom, opened a school in 1872, and by 1876 a post office and trading post had been established a quarter mile west of the mission at what became known as Shawnee Town.
Split into simpler sentences: That first missionary, Joseph Newsom, opened a school in 1872. By 1876 a post office and trading post had been established a quarter mile west of the mission at what became known as Shawnee Town.