Complex sentence: In 2006--07 he moved to Alemannia Aachen in Germany, which had just returned to the Bundesliga after a four-decade absence; during the campaign he appeared in all 34 league matches, but could not help prevent the side's immediate relegation.
Split into simpler sentences: In 2006--07, he moved to Alemannia Aachen in Germany, which had just returned to the Bundesliga after a four-decade absence. During the campaign, he appeared in all 34 league matches, but could not prevent the side's immediate relegation.