Complex sentence: Each study attends to the treatment of a particular technical challenge.Each etude also accustoms a pupil to various speeds (allegro, moderato, etc.) and the various postions on the guitar (3rd, 5th, 7th, 9th).
Split into simpler sentences: Each study attends to the treatment of a particular technical challenge. It also accustoms a pupil to various speeds (allegro, moderato, etc.) and the various postions on the guitar (3rd, 5th, 7th, 9th).