Complex sentence: Also to be introduced that year was "relegation": the lowest-placed countries in the 1993 score table were not invited in 1994, to allow the countries which failed the 1993 pre-selection into the 1994 contest.
Split into simpler sentences: Also to be introduced that year was "relegation". The lowest-placed countries in the 1993 score table were forced to skip the next year, in order to allow the countries which failed the 1993 pre-selection into the 1994 contest.