Here is the original item:
To make Sylvia, the party's hostess, happy. Kelvin steeled himself,
dipped his spoon into the squid eyeball stew, and began to empty the bowl.
You chose to connect the infinitive phrase to the main clause that follows, like this:
To make Sylvia, the party's hostess, happy;
Kelvin steeled himself, dipped his spoon into the squid eyeball stew,
and began to empty the bowl.
Unfortunately, you cannot connect these two parts with a semicolon. Review the rules.