I wrote this sentence:
In this paper, we propose a wrapper generation system for extracting main content from web pages which is easy to use and understand by an average user. At the same time, it is expressive and powerful enough to cover most tasks in content extraction scenarios.
I don't know my usage of "at the same time" is correct or what are alternative words and sentences for my purpose? I mean when you count a benefit of something, but you want to say while it has this benefit, it also has that benefit too which could be a bit in contrast of the first benefit. For example X Software is an easy to use software but ..... covers most advanced tasks.