Complex sentence: He returned to the Spanish Congress at the 1982 General Election representing Álava Province but resigned in February 1984 after being chosen to head the PSOE list in the Basque parliamentary elections.
Split into simpler sentences: He returned to the Spanish Congress at the 1982 General Election representing Álava Province. However he resigned in February 1984 after being chosen to head the PSOE list in the Basque parliamentary elections.