Complex sentence: A review aggregator is a website that collects reviews of products and services, including films, books, video games, software and hardware, enabling users to easily compare many different reviews of the same work.
Split into simpler sentences: A review aggregator is a system that collects reviews of products and services (such as films, books, video games, software and hardware). It's a system that collects reviews of products and services enabling users to easily compare many different reviews of the same work.