Advertisement helps to create awareness about latest products and their offers.
... plural sounds better;
Advertisements help create awareness about latest products and offers.It motivates people to buy more products but is should promote the quality of the product which it already sold
.... What do you mean by "which it already sold? ", that's not really clear to me.... Also I wish you said this differently;
that the advertisements intrigue people
Advertisements attracts people to buy more products because it motivates them to buy by providing offers and discounts.
Advertisement attracts people to buy more products because it motivates them to buy by providing offers and discounts. For example, the recent advertisement in newspaper which shows,"buy one and get one for any product from this shop, offer valid till end of this month". People are attracted to this offer and buy plenty instead of one to save their money.
I think you need to align your reasoning with the topic... The topic suggests that advertisements promotes people to buy more whereas they should promote people to buy better quality. So in this para, you need to bring up that fact;
People are tempted to buy more quantity when advertisements inform them about special offers and discounts of a particular product even when they do not have a real need to buy. For example, "buy one get one free " offer for shampoos may tempt people to buy more than what they really require in hope of having stocks for future use. However, these shampoos may not be as good as in their original quality by the time they are used. In this case, advertisements really do not help people with the quality of soap they use.