Complex sentence: The Eagles have won three NFL championships and played in two Super Bowl games; these were in 1980 (losing 27--10 to the Oakland Raiders) and in 2004 (losing 24--21 to the New England Patriots).
Split into simpler sentences: The Eagles have won three NFL championships and played in two Super Bowl games. These were in 1980 (losing 27--10 to the Oakland Raiders), and in 2004 (losing 24--21 to the New England Patriots).