Complex sentence: He immediately became the club favourite helping the team winning two championships (1978 and 1979) one cup 1978 and was a member in the memorable 1976-77 team that reached the Uefa Cup semi-finals.
Split into simpler sentences: He immediately became the club favourite helping the team winning two championships (1978 and 1979) and one cup 1978. He was also an integral part in the memorable 1976-77 team that reached the Uefa Cup semi-finals.