since then

[dodonaomik]

In GMAT, I saw one sentence:
Founded in 1983, the magzine has since more than doubled its circulation, and its advertising.


I think the above sentence is wrong and the following sentence is right!
Founded in 1983, the magzine has more than doubled its circulation, and its advertising since then.


I don't know whether my thought is right.
THANKS A LOT!

[Rover_KE]

In GMAT, I saw one sentence:
Founded in 1983, the magazine has since more than doubled its circulation (delete comma) and (its) advertising. This is fine.


I think the above sentence is wrong and the following sentence is right:
Founded in 1983, the magazine has more than doubled its circulation (delete comma) and (its) advertising since then.

Rover

[dodonaomik]

Thank you very much!
I like GMAT and GRE, but sometimes they are too hard for me and some words' meanings are too unique and odd.