School Marm= bigger tree with 1 or more little trees growing conjoined or very close by, like a recess lady with a gaggle of brats... I mean childrens running around her, i.e. School Marmmy
They can be an ass ache... If possible cut one at a time, think of the extra tops as being heavy branches, and adjust for lean that way.
You may need spring boards and or climbing gear to get high enough to clear the hangers on.
If the hangers are high enough that they have grown together you can cut under the join and fall the whole werks as one, but don't count on it. When possible remove the hangers and proceed from there.
Enjoy...