Complex sentence: Deeply moved by the unjust treatment they were receiving and missing their steadfast presence in her library, Breed visited the children in the camps, sent books and presents throughout their internment, and spoke out publicly against their treatment.
Split into simpler sentences: Deeply moved by the unjust treatment they were receiving and missing their steadfast presence in her library. Miss Breed visited the children in the camps, sent books and presents throughout their internment, and spoke out publicly against their treatment.