Complex sentence: From 1851 until 1861 Moretti was the music director of the Teatro Nuovo and also taught counterpoint and singing at San Pietro a Majella where he was in great demand for students intending a career in opera.
Split into simpler sentences: From 1851 until 1861 Moretti was the music director of the Teatro Nuovo. During this time he also taught counterpoint and singing at San Pietro a Majella where he was in great demand for students intending a career in opera.