who formerly was useless to you, but now is useful both to you and to me.
which in time past was to thee unprofitable, but now profitable to thee and to me:
Once he was unprofitable to you, but now he is indeed profitable to you as well as to me.
who once was unprofitable to thee, but now is profitable to thee and to me:
He was useless to you before, but now he is useful to both of us.
In times past, he was useless to you, but now he is useful both to me and to you.