Complex sentence: He worked in the field every summer amassing a large collection of packaged bones in matrix, he continued to refine new mounting techniques, prepared specimens, describing some, and attempted unsuccessfully to obtain funding for an earth sciences museum.
Split into simpler sentences: He worked in the field every summer amassing a large collection of packaged bones in matrix. He continued to refine new mounting techniques, prepared specimens, describing some, and attempted unsuccessfully to obtain funding for an earth sciences museum.