Complex sentence: Ortiz made his professional debut for San Lorenzo in 2004, he was loaned to Arsenal de Sarandí for the 2006-2007 season so he played no part in San Lorenzo's Clausura winning campaign.
Split into simpler sentences: Ortiz made his professional debut for San Lorenzo in 2004. He was loaned to Arsenal de Sarandí for the 2006--07 season so he played no part in San Lorenzo's Clausura winning campaign.