Complex sentence: There, he won two leagues in a row and the 1987 European Champions Cup, remaining alongside Jorge into the 1990's, when he finally became a leading trainer, coaching both Porto and Sporting Clube de Portugal.
Split into simpler sentences: There, he won two leagues in a row and the 1987 European Champions Cup. He remained alongside Jorge's into the 1990's, when he finally became a leading trainer, coaching Porto and Sporting Clube de Portugal.