conjunctions

although, even though, in spite of, despite, however

Some theory...

 https://learnenglish.britishcouncil.org/en/grammar-reference/spite-despite-although

 http://www.onlinegrammar.com.au/however-commas-or-semicolons/

...and exercises to practise

http://www.myenglishpages.com/site_php_files/grammar-exercise-although.php

http://www.agendaweb.org/grammar/conjunctions-linking-words.html

http://www.englishpractice.com/quiz/spite-grammar-exercise/