Complex sentence: The current town was first promoted as a municipality around 100 years ago, when it was moved down the Mea-Klong River from the old town, which is now part of Tha Pha municipality.
Split into simpler sentences: The current town was first promoted as a municipality around 100 years ago. It was moved down along Mea-Klong River from the old town, which is now part of Tha Pha municipality.