Complex sentence: In November 2004, Lycos Europe introduced a Microsoft Windows and Mac OS screensaver program called "Make love not spam" which performs what is essentially a DDOS attack on the webservers of known spammers.
Split into simpler sentences: In November 2004, Lycos Europe introduced a Microsoft Windows and Mac OS screensaver program called "Make love not spam". The program worked using peoples computers to perform a DDOS attack on the webservers of known spammers.