The two leadership styles combined have a demonstrable effect on team effectiveness
or
The two leadership styles combined has a demonstrable effect on team effectiveness
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2 Answers
Replacing "the two leadership styles" with the plural "they", you could rephrase the sentence as:
"Combined, they have a demonstrable effect on team effectiveness."
The word "has" is used with a third singular person (he/she/it or a noun), and "have" is used in all other cases. Since "the two leadership styles" is not singular, the entire phrase must be followed by "have".
A complete list of the conjugation for the verb is here.
I think the answer would be the first one
The two leadership styles combined have a demonstrable effect on team effectiveness
Explanation:-
The sentence above is about style, the subject leadarship styles.
Anyone can easily get confused with the words following the subjects ie. combined or any of these merged, mixed, together. Even-if it still conveys the idea that some multiple subjects are combined into one, the verb agreement should always be plural.
That's what I think and I will be glad if anyone makes me correct.
