Complex sentence: UEFA.com, 11 July 2006 where he coached one of his sons, Adrián; under his management the side dropped down a level into the third and he was sacked, also leaving his post in the youth sides due to disagreements with president Ramón Calderón.
Split into simpler sentences: UEFA.com, 11 July 2006 where he coached one of his sons, Adrián. Under his management, the side dropped down a level into the third, and he was sacked, also leaving his post in the youth sides, due to disagreements with president Ramón Calderón.