Complex sentence: He returned to the Panhellenic Socialist Movement in 1989, which won the national elections of 1993, and Gerasimos Arsenis was appointed the Minister of Defence until 1996.
Split into simpler sentences: He returned to the Panhellenic Socialist Movement in 1989. The Panhellenic Socialist Movement won the National elections of 1993, and Gerasimos Arsenis was appointed the Minister of Defence until 1996.