Complex sentence: It later came to power along with the Socialist Party in the "Unidad Popular" ("Popular Unity") coalition in 1970, but was outlawed again following the 1973 coup d'état that deposed President Salvador Allende.
Split into simpler sentences: It later came to power along with the Socialist Party in the "Unidad Popular" ("Popular Unity") coalition in 1970. The party was outlawed after the 1973 coup d'état that deposed President Salvador Allende.