Complex sentence: Before that the library was located at the current historical society, which was built in 1916 with the purpose of becoming a library and the land was donated by John E. Towsend, This land did not become part of the town until September 26,1921.
Split into simpler sentences: Before that the library was located at the current historical society, which was built in 1916 with the purpose of becoming a library. The land was donated by John E. Towsend, and did not become part of the town until September 26,1921.