Complex sentence: He was called the "Burns of Labour" and "the poet of the poor" for his political songs and poems, which were sold widely in penny publications, and recited and sung by workers in Britain, Europe and even America.
Split into simpler sentences: He was called the "Burns of Labour" and "the poet of the poor" for his political songs and poems. These were sold widely in penny publications and recited and sung by workers in Britain, Europe and even America.