Complex sentence: These had more features than the old Netscape version, including better support of HTML 4, CSS, DOM, and ECMAScript; eventually, the more advanced Internet Explorer 5.0 became the market leader.
Split into simpler sentences: These had more features than the old Netscape version, including better support of HTML 4, CSS, DOM, and ECMAScript. The more advanced Internet Explorer 5.0 became the market leader.