Complex sentence: He worked with Paul D. Bartlett on an experiment for testing organic mechanisms in chemistry which involved the use of the molecule bicyclo (2.2.1) heptane, a type of bicyclic molecule.
Split into simpler sentences: He worked with Paul D. Bartlett on an experiment for testing organic mechanisms in chemistry which involved the usage of the molecule bicyclo (2.2.1) heptane. Bicyclo (2.2.1) heptane is a type of bicyclic molecule.