Complex sentence: Weezer's self-titled debut album, also known as the "Blue" album, was released in May 1994 and became a commercial success; it was certified gold on December 1 and platinum on January 1,1995, with sales of over one million.
Split into simpler sentences: Weezer's self-titled debut album, also known as the "Blue" album, was released in May 1994. It was certified gold on December 1 and platinum on January 1,1995, with sales of over one million.