Complex sentence: He is thrown out and goes to the Gorfeins' apartment, who graciously welcome him; he is amazed to see that their orange cat Ulysses found his way home, arriving the previous day.
Split into simpler sentences: He is thrown out and goes to the Gorfeins' apartment. They graciously welcome him; he is amazed to see that their orange cat Ulysses found his way home, arriving the previous day.