Complex sentence: In 1987-1988, he misses the championship in the last ten days, leaving him slip through the IS and the Olympic Club transport, and loses once again the Cup final against the latter on penalties.
Split into simpler sentences: In 1987-1988, the club missed the championship in the last ten days, leaving the club to slip through the IS and the Olympic Club transport. The club sustained loses, once again, in the Cup final against the latter on penalties.