Complex sentence: In the NBA Playoffs, Miami defeated the Philadelphia 76ers in the First round, Boston Celtics in the Eastern Conference Semifinals, and Chicago Bulls in the Conference Finals all in 5 games; however, they lost to the Dallas Mavericks in the Finals in 6 games.
Split into simpler sentences: In the NBA Playoffs, Miami defeated the Philadelphia 76ers in the First round, Boston Celtics in the Eastern Conference Semifinals, and Chicago Bulls in the Conference Finals all in 5 games. However they lost to the Dallas Mavericks in the Finals in 6 games.