Complex sentence: His first season as manager of Crystal Palace (1976/77) was a success, albeit with promotion only being achieved on Wednesday 11 May 1977 with a dramatic away win at promotion rivals Wrexham in Palace's last game of the season.
Split into simpler sentences: His first season as manager of Crystal Palace (1976-1977) was a success. Promotion was achieved in extraordinary fashion on Wednesday 11 May 1977 in a dramatic away win at promotion rivals Wrexham in Palace's last game of the season.