Since the troll romance stuff is important to understand the relationships between the characters, I recommend you don't just disregard it. It's not even complicated, though Hussie and other people like to claim otherwise.
Hearts and Spades are definitely pretty basic seeming, although humans wouldn’t normally consider Spades to be romance necessarily.
My understanding of Diamonds is that it revolves around either mutual or one-way guidance between two characters. Generally like a friendship might be for most people.
Clubs was stranger, but it seems like it occurs when one person mediates between the potential Spades relationship of two others. Preventing it from becoming dangerous or harmful I think?
From what I gathered, the complicated stuff came when Hussie started talking about how troll relationships fluctuated between different combinations and states. Also, the sheer number of potential types of relationships along with the number of characters potentially involved makes it a lot more difficult than it really needs to be.