Complex sentence: After arriving in Ayuthaya in the late 1670s, he embarked on a mission to smuggle arms to Singora; his escapade ended in disaster, however, when he was shipwrecked en route.
Split into simpler sentences: After arriving in Ayuthaya in the late 1670s, he embarked on a mission to smuggle arms to Singora. His escapade ended in disaster, however, when he was shipwrecked en route.