Ellipses

The original text:
Among all its bad influences, the black veil had the one desirable effect, of making its wearer a very efficient clergyman. By the aid of his mysterious emblem–for there was no other apparent cause–he became a man of awful power over souls that were in agony for sin.

I have been given a section, and I need to identify grammatical errors following The Chicago Manual of Style.
At the same time, though, it made him “a very efficient clergyman. He became a man of awful power over souls that were in agony for sin.”
The revised section:
At the same time, though, it made him “a very efficient clergyman. . . . He became a man of awful power over souls that were in agony for sin.”
Have the ellipses been placed accordingly?

Are any other revisions necessary?
Should the first word after an ellipsis be capitalized?
Should bracketed ellipses be inserted in such cases?
Kindly explain.