Complex sentence: On August 27,1902, Macfarland married Miss Olive Knowles Hornbrook who helped him with his work, acting as a skilled technician, and as an artist whose delicate watercolor paintings illustrated many of his scientific publications.
Split into simpler sentences: On August 27,1902, he married Miss Olive Knowles Hornbrook. She helped him with his work, acting as a skilled technician, and as an artist whose delicate watercolor paintings illustrated many of his scientific publications.