Given a sentence in Tagalog language, translate the sentence to English language keeping the meaning of the original sentence intact.

Tagalog sentence: Din habang porpiri ay sa Sisilya, he wrote isang trabaho sa vegetarianism at isang kritikal na gawain laban sa Christian doktrina.
Also while Porphyry was in Sicily, he wrote a work on vegetarianism and a critical work against Christian doctrines.