Complex sentence: However, some argue controversially that the e-grade could sometimes be replaced by an a-grade without the influence of a laryngeal, which might help to explain the vowels in class 6 Germanic verbs, for example.
Split into simpler sentences: However, some argue that the e-grade could sometimes be replaced by an a-grade without the influence of a laryngeal. This is controversial but might help to explain the vowels in class 6 Germanic verbs, for example.