Complex sentence: TorSearch is a search engine that indexes pages to help people find website content in websites located on the Tor network; these websites have neither domain names nor IP addresses and hence aren't usually indexed by traditional search engines.
Split into simpler sentences: TorSearch is an internet search engine that indexes pages to help find content in websites located on the Tor network. Tor websites have neither domain names nor IP addresses and hence aren't usually indexed by conventional search engines.