Complex sentence: The most significant English-language work was Thomas Madox's "Formulare Anglicanum" (1702); but in general the subject was always studied more intensively by continental scholars than by those in Britain.
Split into simpler sentences: The most significant work in English was Thomas Madox's "Formulare Anglicanum", published in 1702. In general, however, the discipline was always studied more intensively by continental scholars than by those in Britain.