Complex sentence: On an abandoned section of Winterfell, young Bran enjoys climbing on the walls where he stumbles on Queen Cersei (Lena Headey) having sex with her twin brother Jaime Lannister (Nikolaj Coster-Waldau).
Split into simpler sentences: On an abandoned section of Winterfell, young Bran enjoys climbing on the walls. He stumbles on Queen Cersei (Lena Headey) having sex with her twin brother Jaime Lannister (Nikolaj Coster-Waldau).