Although Bob Kane achieved renown for creating the fictional superhero Batman, he and others have acknowledged the contributions of Bill Finger for fleshing the character out, writing many of his early stories, and creating the character's origin.
The statement highlights that Bob Kane is credited with creating Batman, but acknowledges the significant role played by Bill Finger in shaping the character.  Finger contributed significantly to Batman's development, including writing many of his early stories and crafting his iconic origin story.