Complex sentence: Topsites should be considered a valuable resource in niche web marketing, typically they have all the benefits of a directory but have the advantage of a dynamic, user powered ranking system which encourages a steady flow of traffic to related sites.
Split into simpler sentences: Topsites should be considered a valuable resource in niche web marketing. Typically, they have all the benefits of a directory but have the advantage of a dynamic, user powered ranking system which encourages a steady flow of traffic to related sites.