请问这段英文,我这样写有什么语法错误吗

请问这段英文,我这样写有什么语法错误吗
Since our corporation signed a contract with * last year,there is a great improvement of our branch awareness at home and abroad.Nowadays,our toys will be exported in bulk to America every month.They are popularity among people,even some local retail stores have sold out already.In this year,there is a new marketing plan in our corporation,which is we are going to establish toy store online.That people who buying in groups will be given the rock-bottom price.It has quality guarantee because our products have to go through vigorous quality control before being served to customers.Rest assured if you do business with us.