Complex sentence: He preferred to wait for a revival of Sacchini's "Œdipe à Colone", in which he sang the far less controversial character of King Theseus, but to no avail: the audience booed and protested at him throughout the whole performance.
Split into simpler sentences: He preferred to wait for a revival of Sacchini's "Œdipe à Colone", in which he sang the far less controversial character of King Theseus. But it was to no avail: the audience booed and protested at him throughout the whole performance.