Complex sentence: From this point, Handel's regular connection with the theatre appears to have diminished; although he remained in Hamburg for a further year, his main source of income was through private lessons, while he planned his long-desired visit to Italy.
Split into simpler sentences: From this point, Handel's regular connection with the theatre appears to have diminished. Although he remained in Hamburg for a further year, his main source of income was apparently through private lessons, as her saved for his long-desired visit to Italy.