Complex sentence: Any person with an Illinois birth certificate can legally change their gender, but in order to legally change it, the state requires transgender people to have an operation (s) having the effect of reflecting, enhancing, changing, reassigning or otherwise affecting gender.
Split into simpler sentences: Any person with an Illinois birth certificate can legally change their gender. In order to legally change it, it is required to have an operation (s) having the effect of reflecting, enhancing, changing, reassigning or otherwise affecting gender.