Simplify the following text for a Grade 9 native English-speaking person.
Original: Helen was also a niece of Anastasia of Montenegro , or Stana , wife of Grand Duke Nicholas Nikolaevich of Russia , and of Milica of Montenegro , wife of Grand Duke Peter Nicolaievich of Russia , the women who introduced Grigori Rasputin to Tsarina Alexandra .
Simplified: Helen was also a niece of Anastasia of Montenegro , or Stana , wife of Grand Duke Nicholas Nikolaevich of Russia , and of Milica of Montenegro . They were the women who introduced Grigori Rasputin to Tsarina Alexandra .