Complex sentence: The President was reportedly deeply involved in drug dealing through the first lady, Maryam Babangida and Gloria Okon (his girlfriend) and the near revelation by Dele Giwa triggered the assassination of the journalist by the Presidential death squad using letter bomb.
Split into simpler sentences: The President was reportedly deeply involved in drug dealing through the first lady, Maryam Babangida, and Gloria Okon (his girlfriend). The near-revelation of that fact by Dele Giwa triggered the assassination of the journalist by the Presidential death squad using a letter bomb.