en_tn/rom/09/01.md

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my conscience bearing witness with me in the Holy Spirit,

This phrase can be made into a separate sentence: "The Holy Spirit controls my conscience and confirms what I say"

that for me there is great sorrow and unceasing pain in my heart.

This can be a separate sentence. AT: "I tell you that I grieve very greatly and deeply." If the person for whom Paul grieves needs to be stated, follow UDB.

great sorrow and unceasing pain

These two expressions mean basically the same thing. Paul uses them together to emphasize how great his emotions are. (See: rc://en/ta/man/translate/figs-doublet)