Complex sentence: Thousands of people in New York and Chicago queued to see the diamond after its 1969 sale, and it was subsequently worn by Taylor at Princess Grace of Monaco's fortieth birthday and at the 42nd Academy Awards.
Split into simpler sentences: Thousands of people in New York and Chicago queued to see the diamond after its 1969 sale. It was subsequently worn by Taylor at Princess Grace of Monaco's fortieth birthday, and at the 42nd Academy Awards.