Complex sentence: He returned to management in February 1998 with CD Tenerife, helping them avoid relegation in his first year; the following campaign, however, he did not see out the year, being sacked after 15 matches as the team was ultimately relegated.
Split into simpler sentences: He returned to management in February 1998 with CD Tenerife, helping them avoid relegation in his first year. The following season, however, he did not see out the year, being sacked after 15 matches as the team was ultimately relegated.