Complex sentence: Lochner probably saw van Eyck's c.1432 "Ghent Altarpiece" during his visit to the lowlands and seems to have borrowed a number of compositional elements.
Split into simpler sentences: Lochner probably saw van Eyck's c.1432 "Ghent Altarpiece" during his visit to the lowlands. He seems to have borrowed a number of motifs and compositional elements.