As for splitting the sea, there will come verses that will speak about it in detail and mention the stories of Pharaoh catching up with the children of Israel, and there isn’t repetition in the Noble Qur’an, rather it is to shine more light on a story in different places in the Holy Qur’an.
﴾فَأَنجَيْنَاكُمْ﴿ “so We saved you”: meaning we saved you from a torment that almost afflicted you, which is drowning. And the story here did not expand on more than just drowning. This story of the drowning is expanded further in other surahs such as surah Yunus and others.