So we notice a comam divides the left side of the sentence and the right side. So the phrase on the right side - what exactly on the left side is it referring to or describing?
Note the second half of the sentence referring to the "proportion" is describing the AMOUNT of the advertising costs. It's not referring to the advertising costs themselves - but rather the AMOUNT. The fact that the amount was a third of the nightclub's expenses is then further described as a a "greater portion" than the proportion of previous years.
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