Sergei although may seem embittered is a kind man who has used his wishes for other people around him. He used his first wish to cure his sister's lung cancer and his second wish to cure his son who has development issues. He is a kind, self-less man who wishes to put the needs of others before himself.
The main themes throughout Romeo and Juliet are the inevitability of fate, love causes violence, and individual vs. society. You can find one of these themes in every act. Hope this helped!
A good way of combine this sentence is:
By jumping into the air, the player had just scored the winning goal.
