Was wondering if someone could possible look over this and tell me what is wrong with it. Please note that my aim is to have the bonus item, followed by its quantity in brackets, each on a new line, but only if there is a bonus item on that level, sort see what i mean?

if("Bonus Item 5"='',if("Bonus Item 4"='',if("Bonus Item 3"='',if("Bonus Item 2"='',concat("Bonus Item 1 (Home-bred animal)",' (',"Bonus Item 1 Quantity",')')),concat("Bonus Item 1 (Home-bred animal)",' (',"Bonus Item 1 Quantity",')',CHAR(10),"Bonus Item 2",' (',"Bonus Item 2 Quantity",')')),concat("Bonus Item 1 (Home-bred animal)",' (',"Bonus Item 1 Quantity",')',CHAR(10),"Bonus Item 2",' (',"Bonus Item 2 Quantity",')',CHAR(10),"Bonus Item 3",' (',"Bonus Item 3 Quantity",')')),concat("Bonus Item 1 (Home-bred animal)",' (',"Bonus Item 1 Quantity",')',CHAR(10),"Bonus Item 2",' (',"Bonus Item 2 Quantity",')',CHAR(10),"Bonus Item 3",' (',"Bonus Item 3 Quantity",')',CHAR(10),"Bonus Item 4",' (',"Bonus Item 4 Quantity",')')),concat("Bonus Item 1 (Home-bred animal)",' (',"Bonus Item 1 Quantity",')',CHAR(10),"Bonus Item 2",' (',"Bonus Item 2 Quantity",')',CHAR(10),"Bonus Item 3",' (',"Bonus Item 3 Quantity",')',CHAR(10),"Bonus Item 4",' (',"Bonus Item 4 Quantity",')',CHAR(10),"Bonus Item 5",' (',"Bonus Item 5 Quantity",')'))