Complex sentence: Overhearing a conspiracy between her father, Pelleas Anthor and others, to track down the members of the Second Foundation, she stows away in a private spaceship owned by her "uncle" Homir Munn to travel to Kalgan.
Split into simpler sentences: Overhearing a conspiracy between her father, Pelleas Anthor and some others, to track down the members of the second foundation. She stows away in a private spaceship owned by her "uncle" Homir Munn to travel to Kalgan.