Complex sentence: During the 1950s and early 1960s, Higgins participated in several of the museum's research expeditions, collecting plant specimens; working as an associate curator with her successor as curator of botany Reid Moran, she helped build the herbarium's specimen collection.
Split into simpler sentences: During the 1950s and early 1960s, Higgins participated in several of the museum's research expeditions, collecting plant specimens. As associate curator working with her successor as curator of botany Reid Moran, she helped build the herbarium's specimen collection.