Complex sentence: However, they could also carry a syllable stress, in which case they were more like vowels, hence some linguists prefer to transcribe them ə 1, ə 2 and ə 3.
Split into simpler sentences: However, they could also carry a syllable stress, in which case they were more like vowels. Thus, some linguists prefer to transcribe them ə 1, ə 2 and ə 3.