Complex sentence: Support for continued use of the name has come from the team's owners and supportive fans which include some Native Americans, who state that the name is honoring the achievements and virtues of Native Americans, and that it is not intended in a negative manner.
Split into simpler sentences: Support for continued use of the name has come from the team's owners and some fans, including some Native Americans. They say that the name honors the achievements and virtues of Native Americans, and that it is not intended in a negative manner.