Complex sentence: The Redcap is the first to openly challenge Harry at his birthday celebration at the Winter Court by kidnapping Sarissa and threatening her life, and ends up being beaten by him in a fight staged by Harry as a game to win her back.
Split into simpler sentences: The Redcap is the first to openly challenge Harry at his birthday celebration at the Winter Court by kidnapping Sarissa and threatening her life. Harry ends up beating the Redcap in a fight staged by Harry as a game to win her back.