Complex sentence: Andronicus II responded by sending an envoy to Paris in 1327, proposing peace and discussions on ecclesiastical union--a French envoy sent in return with Pope John's blessing later in the year, however, found Byzantium beset with civil war and negotiations floundered.
Split into simpler sentences: Andronicus II responded by sending an envoy to Paris in 1327, proposing peace and discussions on ecclesiastical union. A French envoy sent in return with Pope John's blessing later in the year, however, found Byzantium beset with civil war, and negotiations floundered.