Complex sentence: The men agreed to help Tourjee and The New England Conservatory officially opened on February 18,1867 and consisted of seven rooms rented above Music Hall off Tremont Street in downtown Boston.
Split into simpler sentences: The men agreed to help Tourjee, and The New England Conservatory officially opened on February 18,1867. It consisted of seven rooms rented above Music Hall off Tremont Street in downtown Boston.