Complex sentence: The Sm'algyax orthography in use today is based on that developed by Tsimshianicists since the 1960s, beginning with Bruce Rigsby's work on the Gitksan language and including John A. Dunn's work on Sm'algyax and Marie-Lucie Tarpent's work on Nisga'a and Southern Tsimshian.
Split into simpler sentences: The Sm'algyax orthography in use today is based on that developed by Tsimshianicists since the 1960s. It originally stems from Bruce Rigsby's work on the Gitksan language and includes John A. Dunn's work on Sm'algyax and Marie-Lucie Tarpent's work on Nisga'a and Southern Tsimshian.