Complex sentence: When he reached Gdansk and found his rival Augustus II, elector of Saxony, already in possession of the Polish crown, he returned to France, where he was graciously received by Louis, although St Simon says the king was vexed to see him again.
Split into simpler sentences: When he reached Gdansk, he found his rival Augustus II, Elector of Saxony, already in possession of the Polish crown. Conti returned to France, where he was graciously received by Louis, although the duc de Saint-Simon says the king was vexed to see him again.