Is this sentence correct?

[PlacidRan]

Correct version: "I knew this doctor. He was known as Sam Johns."
Alternate version: "I knew this doctor, Sam Johns, he was known as."

Is the above sentence correct? My concern is about the punctuation marks (commas, in this case) after "doctor," and after "Johns." Is the use of commas acceptable in the above context? Also, can the above sentence (alternate version) serve as an independent clause?

 

[2010]

Correct version: "I knew this doctor. He was known as Sam Johns."
Alternate version: "I knew this doctor, Sam Johns, he was known as."

Is the above sentence correct? My concern is about the punctuation marks (commas, in this case) after "doctor," and after "Johns." Is the use of commas acceptable in the above context? Also, can the above sentence (alternate version) serve as an independent clause?

==Not a teacher===

I knew this doctor. Sam Johns, he was known as.

I don't know, which one you are referring to as "independent clause."

I knew this doctor - Independent clause.
Sam Johns, he was known as - Independent clause.

This is my thought. Let's see what an expert has got to say!

 

[PlacidRan]

Thanks, 2010.
But I don't like having two short independent clauses (in this case).
"I knew this doctor, Sam Johns, he was known as." Anything wrong with this sentence?

 

[emsr2d2]

Thanks, 2010.
But I don't like having two short independent clauses (in this case).
"I knew this doctor, Sam Johns, he was known as." Anything wrong with this sentence?

It simply doesn't read naturally.

"I knew this doctor" is a standalone statement and I believe should be followed by a full stop. The additional information, although the word order is different to how we would normally expect to see it, is still another separate statement.

In exactly the same way as your first example "I knew this doctor. He was known as Sam Johns", the two halves are much more natural as two separate entities.

I knew this doctor. Sam Johns, he was known as.

Other examples:

I had a cat once. Black and white, I think it was.
He ate a huge steak last week. A pound a half, it was!!

 

[RonBee]

"I knew this doctor, Sam Johns, he was known as."

There are a couple of things wrong with that. First, it should be two sentences. Second, the second sentence is incomplete. He was known as what?

 

[litcher]

I think that instead of two short sentences it could be written with a semicolon between the two clauses.

"I knew this doctor; Sam Jones, he was known as."

 

[2010]

I think that instead of two short sentences it could be written with a semicolon between the two clauses.

"I knew this doctor; Sam Jones, he was known as."

As emsr2d2 said, I would prefer this sentence as it sounds more natural ;-)

"I knew this doctor. He was known as Sam Johns",

 

[emsr2d2]

I'm starting to wonder why this doctor didn't use his real name! Why was he only "known as" Sam Johns? What was he actually called?!