Complex sentence: Although the content of web pages is technically already capable of "automated processing," and has been since the inception of the web, such processing is difficult because the traditional markup tags used to display information on the web do not describe what the information means.
Split into simpler sentences: Although the content of web pages is technically already capable of "automated processing," and has been since the inception of the web, there are certain limitations. This is because the traditional markup tags used to display information on the web do not describe what the information means.