Complex sentence: Lady Glossop is more sympathetic towards Bertie's woolly-headedness that her spouse, and is in the future always willing to give Bertie a second chance, and consequently Bertie feels more comfortable with her than Sir Roderick.
Split into simpler sentences: Lady Glossop is more sympathetic towards Bertie's woolly-headedness that her husband, and is in the future always willing to give Bertie a second chance. Consequently, Bertie feels more comfortable with her than Sir Roderick.