Complex sentence: Luciani believes there is a mole in his organization and decides to use Malik to assassinate Jacky Marcaggi, the Don of the Corsican mafia, for secretly dealing with the Lingherris.
Split into simpler sentences: Luciani believes there is a mole in his organization. He decides to use Malik to assassinate Jacky Marcaggi, the Don of the Corsican mafia, for secretly dealing with the Lingherris.