Complex sentence: By 1889 the influence of Blatchford was beginning to be fully felt, the Clarion movement was having a profound effect on the Labour movement it was effecting the communities throughout the North and holding the movement together when perhaps its support would have dwindled.
Split into simpler sentences: By 1889 the influence of Blatchford was beginning to be fully felt, the Clarion movement was having a profound effect on the Labour movement. It was affecting the communities throughout the North and holding the movement together when perhaps it's support would have dwindled.