Complex sentence: While with the 49ers Harrison made it to the NFC Championship game three times, in 1990,1992 and 1993, however losing each year, twice to the Dallas Cowboys (1992,1993) and once to the New York Giants (1990).
Split into simpler sentences: While with the 49ers Harrison made it to the NFC Championship game three times, in 1990,1992 and 1993. Harrison went to the playoffs all three years, however the 49ers lost in the conference championship all three times, twice to the Dallas Cowboys (1992,1993) and once to the New York Giants (1990).