Complex sentence: Griffiths wrote several major works on Egyptian religion, as well as work on Latin and Greek texts, though he is better known in Wales for his poetry; of which he published four collections of texts, all in the Welsh language.
Split into simpler sentences: Griffiths wrote several major works on Egyptian religion, as well as work on Latin and Greek texts. However, he is better known in Wales for his poetry, of which he published four collections of texts, all in the Welsh language.