Complex sentence: They were particularly concerned with women's education and with incorporating the ideas of Joseph Heinrich Pestalozzi and the French reformer Joseph Jocotot into American schools, both of whom had stressed the importance of observation and of geography.
Split into simpler sentences: They were particularly concerned with women's education and with incorporating the ideas of Joseph Heinrich Pestalozzi and the French reformer Joseph Jocotot into American schools. Both of these men had stressed the importance of observation and of geography.