Complex sentence: The major turning point in her career happened in 1962 she was one of about a dozen photographers who were invited by Dr. Edwin Land and the Polaroid Corporation to test their new instant-developing color film.
Split into simpler sentences: The major turning point in her career happened in 1962. She was one of about a dozen photographers who were invited by Dr. Edwin Land and the Polaroid Corporation to test their new instant-developing color film.