Just to add to the other answer, The final series arc post Sailor Moon SuperS, titled Sailor Moon Sailor Stars was completely excluded from the American version.
The story line featured 3 Sailor Soldiers from outerspace, The Sailor Starlights, posing as male Pop Stars. They are looking to stop another Sailor senshi/soldier, Sailor Galaxia from becoming the most power senshi in the galaxy by steeling human's of Earth's star seeds. When they transformed into sailor soldiers, they transform from men into women and one of the characters, Seiya had a massive crush on Usagi (Sailor Moon), as Mamoru (Tuxedo Mask) is absent for part of the story line...
This series was not dubbed during the original run of the English dub
because around the mid-2000s, the license for this season was cut off
by Toei Animation from being distributed anywhere outside Japan; a
common misconception was that it was because of the genderbending
nature of the Sailor Starlights, which wouldn't get past American
censors due to possibly promoting transgender and homosexual themes.
Although it's been sited this exclusion was do to Toei Animation licensing issue, there are many who argue it was also for other reasons, such as the genderbending aspects, more violent then previous series, and whose former religious undertones become more overt and materialize, as Sailor Moon gains "wings" and becomes The Messiah.
The argument seems valid to me, given the way Viz handled the former source material.