Complex sentence: Originally the district was named Doem Bang Kao (เดิมบางเก่า), it was renamed in 1911 to Ban Chian after the central "tambon", as the "tambon" Doem Bang was at the same time reassigned to the newly created Doem Bang district.
Split into simpler sentences: Originally the district was named Doem Bang Kao (เดิมบางเก่า). It was renamed in 1911 to Ban Chian after the central "tambon", as the "tambon" Doem Bang was at the same time reassigned to the newly created Doem Bang District.