Complex sentence: On May 4th, "Chiyodagata" was captured by Imperial forces after having been abandoned in a grounding, and on the 7th, "Kaiten" was heavily hit and put out of action.
Split into simpler sentences: On May 4th, "Chiyodagata" was captured by Imperial forces after having been abandoned in a grounding. On the 7th, "Kaiten" was heavily hit and put out of action.