We cannot edit themes or templates and insert any HTML into them so every post becomes the same length when the text is split. Some themes are coded to do this like Fusion and Inuit Types but most are not. We can insert "the more tag" into our posts to split text which will result in the beginnings of posts on the front page followed by a link visitors can click to read the full post on its own page. A Few themes have active excerpt functions that can be used to achieve this.