Some members broke away from the environmental group and formed a new splinter organization due to disagreements.

splinter 来自动词 splinter（分裂、碎裂），这里用作形容词修饰 organization。splinter 本义指木头或玻璃等材料碎裂后形成的小碎片，引申为"从大组织中分裂出来的小派系"。 splinter organization 指从原组织分裂出来的小团体或派系组织。