Complex sentence: He was taken to hospital in Odessa after a concert; on 14 February 1880 Tchaikovsky's patroness Nadezhda von Meck took him in to her home and provided him with medical attention.
Split into simpler sentences: He was taken to hospital in Odessa after a concert. On 14 February 1880, Tchaikovsky's patroness Nadezhda von Meck took him into her home and provided him with medical attention.