@Tyler_Lyon We recently had a group in this scenario. In this group, 4 couples were from around the same town 15 miles away.
Approach this scenario with humility, understanding and gentleness.
Cast VISION of why and how relationships grow better in smaller settings.
It can be easier depending on the state of your relationship with the group's leader.
If the leader is on board with the split, it can make the transition more smooth.
I found a key strategy is to focus only on the positive benefits and don't hit on anything negative, including using the right words such as "multiply" not "divide" or "split".
Another strategy to be used is to explain how the groups can come together monthly or quarterly to do special events or hangouts. This has proved effective with this last group that just multiplied!
Summary: Focus on and explain only the positive aspects, cast the VISION of why and how relationships can grow better in smaller settings, get the leader on board.