Complex sentence: After receiving his doctorate in 1952, he continued the study of transition metal and organometallic chemistry, writing a thesis on "The Metal Complexes of Cyclopentadienes and Indenes".
Split into simpler sentences: After receiving his doctorate in 1952, he continued his research on the organometallic chemistry of the transition metal and. His thesis on "The Metal Complexes of Cyclopentadienes and Indenes".