Complex sentence: The second generation, known officially as "Blue and White", was introduced at the 1999 MacWorld San Francisco on January 5,1999 and was discontinued when its replacement, the Power Mac G4 was introduced in August of the same year.
Split into simpler sentences: The second generation, known officially as "Blue and White", was introduced at MacWorld San Francisco on January 5,1999. Its replacement, the Power Mac G4, was introduced in August of the same year.