Complex sentence: One of these letters reached Mother Bonneau, the R.H.S.J. Superior in Montréal at the time who had been so moved that she sent him $2.50 and also stated that if he was considering building a hospital in Windsor they would be happy to help.
Split into simpler sentences: One of these letters reached Mother Bonneau, the R.H.S.J. Superior in Montréal. She was so moved that she sent Wagner $2.50 and said that if he were considering building a hospital in Windsor, her order would be happy to help.