Complex sentence: The Korean cavalry suffered many casualties in this melee while others attempting to escape drowned while trying the cross back north using deeper parts of the river, amongst the Korean Generals Yu Geuk-ryang and Sin Hal were killed.
Split into simpler sentences: The Korean cavalry suffered many casualties in this melee while others attempting to escape drowned while trying to cross back north using deeper parts of the river. Amongst the Korean Generals Yu Geuk-ryang and Sin Hal were killed.