GOD'S WORD® Translation
There was a long succession of priests because when a priest died he could no longer serve.

American Standard Version
And they indeed have been made priests many in number, because that by death they are hindered from continuing:

Berean Study Bible
Now there have been many other priests, since death prevented them from continuing in office.

Douay-Rheims Bible
And the others indeed were made many priests, because by reason of death they were not suffered to continue:

English Revised Version
And they indeed have been made priests many in number, because that by death they are hindered from continuing:

King James Bible
And they truly were many priests, because they were not suffered to continue by reason of death:

World English Bible
Many, indeed, have been made priests, because they are hindered from continuing by death.

Young's Literal Translation
and those indeed are many who have become priests, because by death they are hindered from remaining;

Hebrews 7:23 Additional Translations ...