Complex sentence: She continued working for the same company and in 1950, she designed sets for Swan Lake (Act II), Peter and the Wolf and Prasnik.However, the next year she designed decor and costumes for a full length Swan Lake.
Split into simpler sentences: She continued working for the same company and in 1950, she designed sets for "Swan Lake" (Act II), "Peter and the Wolf" and "Prasnik". The next year she designed decor and costumes for a full length Swan Lake.