Complex sentence: She wrote, in 1880, a description of the lectures during the previous session, and she delivered a paper titled "Friendship in Aristotle's Ethics" during the Concord session of July, 1887.
Split into simpler sentences: She wrote, in 1880, a description of the lectures during the previous session. She delivered a paper titled "Friendship in Aristotle's Ethics" during the Concord session of July, 1887.