Complex sentence: Lake later served as National Security Advisor (1993-1997), and following Clinton's 1996 reelection, Lake was nominated to become the Director of the Central Intelligence Agency, but his nomination was withdrawn due to Republican opposition.
Split into simpler sentences: Lake later served as National Security Advisor (1993-1997). Following Clinton's 1996 re-election, Lake was nominated to become the Director of the Central Intelligence Agency, but his nomination was withdrawn due to Republican opposition.