For it was fitting for him, because of whom and through whom all things exist, who had led many children into glory, to complete the authorship of their salvation through his Passion
Other versions
King James Version
For it became him, for whom are all things, and by whom areEnglish Standard Version
For it was fitting that he, for whom and by whom all things exist, in bringing many sons to glory, should make the founder of their salvation perfect through suffering.New International Version
In bringing many sons to glory, it was fitting that God, for whom and through whom everything exists, should make the author of their salvation perfect through suffering.