Complex sentence: Sylvia's surname was never mentioned on screen, and was only discovered when seen on her official cast card, and has caused some confusion as another character named Mrs Weng-Chung worked in the café prior to her appearance.
Split into simpler sentences: Sylvia's surname is never mentioned on screen, and only stated on her official cast card. This has caused some confusion as another character named Mrs Weng-Chung worked in the café prior to her appearance.