Complex sentence: He initially intended the Society to become the first regional branch of the Social Democratic Federation (SDF), but this idea was abandoned when the Socialist League, led by Morris, split from the SDF, and the Society remained unaffiliated to any national current.
Split into simpler sentences: He initially intended for the Society to become the first regional branch of the Social Democratic Federation (SDF). This idea was abandoned when the Socialist League, led by Morris, split from the SDF, and the Society remained unaffiliated to any national current.