Complex sentence: This river is one of few worldwide which experience a tidal bore, a visible rush of seawater twice daily during the incoming tide, caused by the funnel shape of the Bay of Fundy and the high tides which are experienced in the region.
Split into simpler sentences: This river is one of few rivers worldwide which experience a phenomenon called the Tidal Bore, a visible rush of seawater twice daily during the incoming tide. This is due to the funnel shape of the Bay of Fundy and the high tides which are experienced in the region.