Masako Sen ( , Sen Masako , born 23 October 1951) , formerly Princess Masako of Mikasa ( , Masako Naishinno ) , is the fourth child and second daughter of Takahito, Prince Mikasa and Yuriko, Princess Mikasa. She married Soshitsu Sen on 14 October 1983. As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law.

Based on that paragraph can we conclude that this sentence is true?
Soshitsu Sen was apart of the Japanese Imperial Family
No