Complex sentence: She was one of four women who became fellows of the Geological Society that year and she established a new lifelong scientific partnership and friendship with Marjorie Chandler who had obtained a first class degree in the natural sciences at Cambridge University the year before.
Split into simpler sentences: She was one of four women who became fellows of the Geological Society that year and she established a new lifelong scientific partnership and friendship. Her new scientific collaborator was Marjorie Chandler who had obtained a first class degree in the natural sciences at Cambridge University the year before.