Complex sentence: The name of the river may predate the Gaelic language as its meaning is not known although it is possible that the name stems from an individual personal name, Comhan (genitive Comhain).
Split into simpler sentences: The name of the river is believed to predate the Gaelic language, and its meaning is not known. It is possible that the name stems from an individual personal name, Comhan (genitive Comhain).