Complex sentence: The upper part of the river is sometimes named "Mirnščica" or "Mirenščica", although the expert on Slovene language Ivan Gregorčič and the geographer Maja Topole have characterised the latter form as incorrect.
Split into simpler sentences: The upper part of the river is sometimes named "Mirnščica" or "Mirenščica". The expert on Slovene language Ivan Gregorčič and the geographer Maja Topole have characterised the latter form as incorrect.