Complex sentence: Trullet has been the manager of Unión de Santa Fe on three occasions (1990--1991,1995--1997,2006--2007), in his second spell with the club he helped them to secure promotion to the Argentine Primera in 1996.
Split into simpler sentences: Trullet has been the manager of Unión de Santa Fe on three occasions (1990--1991,1995--1997 and 2006--2007). In his second spell with the club he helped them to secure promotion to the Argentine Primera, in 1996.