Complex sentence: Tolstoy entertained almost all the important Russian cultural and artistic figures of his time at Yasnaya Poloyana; his guests included Anton Chekhov, Turgenev, Maxim Gorky, the painters Valentin Serov, and Ilya Repin, and many others.
Split into simpler sentences: Tolstoy entertained almost all the important Russian cultural and artistic figures of his time at Yasnaya Poloyana. His guests are known to have included Anton Chekhov, Turgenev, Maxim Gorky, the painters Valentin Serov, and Ilya Repin, as well as many others.