Complex sentence: Historian of fencing Jacopo Gelli considered Rosaroll and Pietro Grisetti as the re-generators of the true "Scuola Napoletana" of fencing, both were students of Tommaso Bosco e Fucile who was a Maestro of fencing in Naples.
Split into simpler sentences: Historian of fencing Jacopo Gelli considered Rosaroll and Pietro Grisetti as the scions of the true "Scuola Napoletana" of fencing. Both were students of Tommaso Bosco e Fucile who was a Maestro of fencing in Naples.