Horse is related to Art. Art is related to Piece. Piece is related to Unit. Unit is related to Squad. 
Complicated is the opposite of Simple. Simple is related to Add. 
Horse <--RelatedTo--> Art <--RelatedTo--> Piece <--RelatedTo--> Unit <--RelatedTo--> Squad 
Complicated <--Antonym--> Simple <--RelatedTo--> Add 