Complex sentence: Trudgill found that middle-class women were introducing the RP vowels in Norwich; working-class men were also introducing variation by borrowing a similar vowel associated with working-class speech from a nearby area.
Split into simpler sentences: Trudgill found that middle-class women were introducing the RP vowels in Norwich. Working-class men were also introducing variation by borrowing a similar vowel associated with working-class speech from a nearby area.