Complex sentence: In that regard, he was a supporter of Republican causes and, in 1869, his studio served as a meeting place for high-level organizers from the IWA; a meeting arranged by Pellicer's nephew, Rafael Farga i Pellicer, a prominent anarchist.
Split into simpler sentences: In that regard, he was a supporter of Republican causes and, in 1869, his studio served as a meeting place for high-level organizers from the IWA. The meeting was arranged by Pellicer's cousin, Rafael Farga i Pellicer, a prominent anarchist.