Ye also helping together by prayer for us, that for the gift bestowed upon us by the means of many persons thanks may be given by many on our behalf.
Helping together by prayer for us - rather, 'helping together, on our behalf by your supplication' х deeesei (G1162)]. "For us" in the Greek follows "helping together," not "prayer."
That for the gift ... - literally, 'that on the part of many persons the gift (literally, gift of grace х charisma (G5486)]) bestowed upon us through (the prayers of) many may be offered thanks for on our behalf.'