How can a Guild have 2 or more leaders?

Our next guild challenge opponents has 2 leaders and a number of right hands but I don't know how to achieve this?
The leader was probably inactive, and Support probably made someone else leader when a ticket was raised about it. Probably didn't demote the inactive player so now there are two leaders.

FYI, I've seen guilds with 4 leaders, and plenty of RH, but all were pretty much inactive.

Would be interested to know what happened if the player came active again?
Got it - thanks