Complex sentence: She was part of the Legion group who were sent to the 20th century by the Emerald Eye and, not feeling any affiliation to the Legion, elected to remain there when the others returned to the 30th century.
Split into simpler sentences: She was part of the Legion group who were sent to the 20th century by the Emerald Eye. Later, not feeling any affiliation to the Legion, elected to remain there when the others returned to the 30th century.