Complex sentence: Humphries has regularly updated Edna, originally a drab Melbourne housewife satirising Australian suburbia; and, then he caused the Edna character to adopt an increasingly outlandish wardrobe after performances in London in the 1960s through which his Edna character grew in stature and popularity.
Split into simpler sentences: Humphries has regularly updated Edna, originally a drab Melbourne housewife satirising Australian suburbia. The character adopted an increasingly outlandish wardrobe after being performed in London in the 1960s, and grew in stature and popularity.