Complex sentence: In 1797 he published "Metodo per Violino", a treatise on violin playing; it can be regarded as demonstrating the style of a transitional period between the Baroque and Classical era.
Split into simpler sentences: In 1797 he published a treatise on violin playing, "Metodo per Violino". It is regarded as one of the treatises of the transitional period between the Baroque and Classical era.