Complex sentence: At a Christmas holiday party, nervous about his personal lot, Daniel drinks too much to build up his courage to declare his love for Carla, also telling everyone about their first time making love.
Split into simpler sentences: At a Christmas holiday party, nervous about his personal lot, Daniel consumes too much alcohol in an effort to build his courage to make his love for Carla known to everybody. He publicly declares his love to Carla, also relating to everyone at the party about their first time making love.