Complex sentence: A number of manuscripts written between 1580 and 1600 have been ascribed to him, it is mainly due to Polerio's works that it is possible to appreciate Spanish and Italian chess of the period.
Split into simpler sentences: A number of manuscripts written between 1580 and 1600 have been ascribed to him. It is mainly due to Polerio's works that it is possible to appreciate Spanish and Italian chess of the period.