Complex sentence: At the 9th National Congress, he was elected Secretary-General of the People's Party and was confirmed in this office at the last three national congresses of the PP which took place in Seville (1990) and Madrid (1993 and 1996).
Split into simpler sentences: At the 9th National Congress of the People's Party, he was elected Secretary-General. He was confirmed three times in this office at the national congresses of the PP which took place in Seville (1990) and Madrid (1993 and 1996).