Complex sentence: For the second part of 2009--10 Marić returned to Spain and its division two, signing with Real Unión, appearing rarely during the season (less than 1/2 of the league matches) and also suffering team relegation.
Split into simpler sentences: For the second part of 2009--10 Marić returned to Spain and its division two, signing with Real Unión. He appeared rarely during the season (less than 1/2 of the league matches), also suffering team relegation.