Mercy Otis Warren was continually at or near the center of political events from 1765 to 1789, and this vantage point , combined with her talent for writing, made her one of the most valuable historians of the ear. The idea is that they are both important. The vantage point is a bit more important, as it is mentioned first and more directly.
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CliveHi,
The commas are really just here to make the sentence more readable and easier to understand. They help the reader to find the different parts of the sentence. They do not really effect the meaning that the reader draws.
It's often useful to consider a simpler and more concrete example in cases like this.
Here's one.
Context: a crowd of p
CliveHi,
This vantage point, combined with his height, gave Tom the best view.
My feeling is that the word 'combined' so strongly ties the two phrases together that the presence or absence of the commas makes no real difference to the meaning.
Do you really think the writer meant something like this?
This vantage point gave Tom the best view. O
CliveHi,
I thought I already explained that this is incorrect grammar. Maybe I didn't. I forget.
You need to say it this way.
Mercy Otis Warren was continually at or near the center of political events from 1765 to 1789,
a vantage point which, when combined with her talent for writing, made her one of the most valuable historians of