Complex sentence: In 2009, Thalía signed a contract with Sony Music after 14 successful years with EMI Music and released her first live album "Primera fila", which was certified diamond plus three times platinum by AMPROFON for selling over half a million copies only in Mexico.
Split into simpler sentences: In 2009, after 14 years with EMI Music, Thalía signed a contract with Sony Music. That same year, she released her first live album, "Primera Fila", which was certified diamond and three times platinum by AMPROFON for selling half a million copies in Mexico.