Complex sentence: Simonds d'Ewes is perhaps best known for his work as an antiquarian, and particularly for his transcriptions of important historical documents, originals of which do not survive today, and the "Journals of all the Parliaments during the Reign of Queen Elizabeth".
Split into simpler sentences: Simonds d'Ewes is perhaps best known for his work as an antiquarian. He is known for his transcriptions of important historical documents, most of which do not survive today, and the "Journals of all the Parliaments during the Reign of Queen Elizabeth".