Complex sentence: Achille was then battered by broadsides from many ships, lastly the "HMS Prince", until fires reached her magazine and she blew up spectacularly at 5.45pm, marking the end of the battle.
Split into simpler sentences: Achille was then battered by broadsides from many ships, finallly the HMS "Prince". The fires eventually reached her magazine and she blew up spectacularly at 5.45pm, marking the end of the battle.