Complex sentence: He gave up his initial plans of studying medicine when he was engaged as a laboratory photographer by Yale's Medical School, where later in 1928 he became director of the photography department and invented several machines such as a projector for microscope images.
Split into simpler sentences: He gave up his initial plans of studying medicine when he was engaged as a laboratory photographer by the Yale School of Medicine. Later, in 1928, he became director of their photography department, and invented several machines such as a projector for microscope images.