Complex sentence: Grand emperor Trần Thánh Tông and emperor Trần Nhân Tông went to Tam Trĩ by means of a small boat, while the official royal boat went to Ngọc Sơn to mislead the invaders, but they were discovered.
Split into simpler sentences: Grand emperor Trần Thánh Tông and emperor Trần Nhân Tông went to Tam Trĩ by means of a small boat. The luxurious one went to Ngọc Sơn to mislead the invaders, but they were discovered.