Complex sentence: In 1917 he published a treatise on Rembrandt called "Rembrandt og Saskia i deres hjem" (Rembrandt and Saskia in their home), and in his will he donated his art collection to the Drammen city museum.
Split into simpler sentences: In 1917 he published a treatise on Rembrandt called "Rembrandt og Saskia i deres hjem" (Rembrandt and Saskia in their home). In his will he donated his art collection to the Drammen city museum.