and with comma

[kramacha1979]

Is this ok ?

X demonstrated that the world's capital markets are more closely integrated than ever before and that events in one part of the global ....

I was thinking if we join 2 clauses w and, we need a comma

X demonstrated that the world's capital markets are more closely integrated than ever before, and that events in one part of the global ....

[JonathanSchneider]

The first version is actually better. This is because both "that..." clauses stem from "demonstrated." By inserting a comma, you would be breaking up the connection. Now, if the first "that..." clause were VERY long, you might have a comma before the second one, just as a natural pause. However, when the two "that" clauses are closer, as in this case, no comma is necessary.