Complex sentence: Still, Klain was seen as too loyal to Clinton by some longtime Gore advisors, and when feuding broke out between Clinton and Gore loyalists in the White House in 1999, Klain was ousted by Gore campaign chairman Tony Coelho in August of that year.
Split into simpler sentences: Still, Klain was seen as too loyal to Clinton by some longtime Gore advisors. Feuding broke out between Clinton and Gore loyalists in the White House in 1999, and Klain was ousted by Gore campaign chairman Tony Coelho in August of that year.