Original sentence: It is unknown how much favouritism the Hufflepuff and Ravenclaw Heads show, although it can be deduced that it's minimal or non-existent, as both Professor Filius Flitwick (Ravenclaw) and Professor Pomona Sprout (Hufflepuff) are kind, lighthearted people, who obviously want to win the House and Quidditch Cups but are not as vindictive as Snape in going about it
Edited sentence: We do not know how much favouritism the Hufflepuff and Ravenclaw Heads show, although it can be deduced that it's minimal or non-existent, as both Professor Filius Flitwick (Ravenclaw) and Professor Pomona Sprout (Hufflepuff) are kind, lighthearted people, who obviously want to win the House and Quidditch Cups but are not as vindictive as Snape in going about it