Complex sentence: The storyline then jumps ahead two years later; with Grievous having claimed numerous victories for the Separatists, the Republic is in need of more Jedi Knights, and after much consideration, the Jedi Council decides to promote Anakin to a Knight.
Split into simpler sentences: The storyline then jumps ahead two years later; with Grievous having claimed victories for the Separatists, the Republic is in need of more Jedi Knights. After much consideration, the Jedi Council decides to promote Anakin to a Knight.