Complex sentence: In June 1934, Watson left D'Oyly Carte to rejoin the Carl Rosa company, touring for six months in a range of operas including Wagner's "Tannhaüser".
Split into simpler sentences: In June 1934, Watson left D'Oyly Carte. He rejoined the Carl Rosa company, touring for six months in a range of operas including Wagner's "Tannhaüser".