We all know that nowadays and in the past as well women have really important effects on several aspects of human's life.
...this is pretty weak as your opening sentence :( .... It really does not reveal any meaningful idea to the reader. I think you should open your essay with a greater punch. Tell something more relevant to your essay, something that can arouse curiosity of the reader.
In the modern society, people's knowledgeperception about the position between men and women has been changed particularly compared with that in 100 years ago.
... it is the perception that has changed and not the knowledge; "perception" means how you view things!
In the modern society, the perception about women is quite different from the what it was in the past.Although men's and women's position have evaluated equally in several cases, it still exists sexistgender discrimination in many cases.
Although some people claim that there is no gender discrimination and both genders are equal, still there instances where such discrimination exists in different forms.