Complex sentence: In addition to assisting him with his masterwork, "La Nouvelle Geographie", Galleani worked with Reclus to organize a demonstration of students at the University of Geneva in 1887 in honor of the Haymarket martyrs of Chicago, who were killed in labor unrest.
Split into simpler sentences: In addition to assisting him with his masterwork, "La Nouvelle Geographie", Galleani worked with Reclus to organize a demonstration of students at the University of Geneva in 1887. The event was held in honor of the Haymarket martyrs of Chicago, who were killed in labor unrest.