Complex sentence: He also worked as an itinerant actor and in 1906 he moved to the East Coast and in the 1910s he contributed many illustrations to both "Red Book" magazine and its sister publication, "Green Book".
Split into simpler sentences: He also worked as an itinerant actor and in 1906 he moved to the East Coast. In the 1910s he contributed many illustrations to both "Red Book" magazine and its sister publication, "Green Book".