Complex sentence: Like his eventual collaborator Myles Horton he travelled to Denmark to tour the Danish folk schools, and upon their return they co-founded the Highlander Folk School in Monteagle, Tennessee.
Split into simpler sentences: Like his eventual collaborator Myles Horton he travelled to Denmark to tour the Danish folk schools. Upon their return they co-founded the Highlander Folk School in Monteagle, Tennessee.