Complex sentence: In June 2001, Mekatelua signed a contract with record company D.D.M. in order to achieve a more professional level of promotion and distribution which led an upgraded version of their demo Comin Nao (adding winds, percussions and dubs).
Split into simpler sentences: In June 2001, Mekatelua signed a contract with record company D.D.M. in order to achieve a more professional level of promotion and distribution. Thanks to this new alliance they brought to the market a newer, more professional look with an upgraded version of their demo Comin Nao (added winds, percussions and dubs).