9:5a So I thought it necessary to urge the brothers to visit you beforehand

Therefore I thought that urging the brothers to visit you (plur.) first was necessary.
-or-
So, I decided that I needed to encourage the ⌊three⌋ fellow-believers to ⌊go and⌋ visit you before I arrive.

9:5b and make arrangements for the bountiful gift you had promised.

Before I arrive, they will arrange the blessing ⌊to the poor believers⌋ that you had earlier promised.
-or-
They will help you to finish preparing/gathering the gift that will cause many to thank God, that is, the gift that you had promised to give.

9:5c This way, your gift will be prepared generously

If you do that, you will have prepared it as a gift that will benefit ⌊the poor believers⌋,
-or-
Then you would make it a gift that blesses,
-or-
May your gift be a gift of generosity,

9:5d and not begrudgingly.

and not as something you feel forced to do. (NET Bible)
-or-
and not because anyone has required/compelled you to give.
-or-
not as one grudgingly given (New International Version)

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