Complex sentence: Before he dies, Yoda confirms that Vader is Luke's father; moments later, the spirit of Obi-Wan tells Luke that he must face his father before he can become a Jedi, as well as that Leia is his twin sister.
Split into simpler sentences: Before he dies, Yoda confirms that Vader is Luke's father. Moments later, Obi-Wan's spirit tells Luke that he must confront his father before he can become a Jedi, and that Leia is his twin sister.