Complex sentence: If "Mormair" is genitive of "Mormaer", then language actually suggests it was Indrechtach being called Mormaer, however it is clear from the context that the text is corrupt, and that Dubacan was indeed meant as Mormaer.
Split into simpler sentences: If "Mormair" is genitive of "Mormaer", then language actually suggests it was Indrechtach being called Mormaer. However it is clear from the context that the text is corrupt, and that Dubacan was indeed meant as Mormaer.