Simplify the following text for a Grade 9 native English-speaking person.
Original: It was very popular and inspired 2 more shows , one made in the early 1990s and another in 2002 , there was also a spin-off , called She-Ra : Princess of Power , which was about He-Man 's sister .
Simplified: The show was so successful that it spawned a spin-off series , She-Ra : Princess of Power following the adventures of He-Man 's sister .