Complex sentence: A good and understanding coach to his current and former pupils, Celestino takes pride seeing them succeed and is affectionately nicknamed "Ciao Ciao" by Phichit, due to using the words frequently to greet other people.
Split into simpler sentences: A good and understanding coach to his current and former pupils, Celestino takes pride seeing them succeed. He is affectionately nicknamed "Ciao Ciao" by Phichit, due to using the words frequently to greet other people.