Complex sentence: Luke frees himself and a fight ensues with Jabba's guards and Boba Fett, who has been working for Jabba since delivering Han, engages Luke in battle but his jet pack is inadvertently struck by a semi-blind Han, sending him flying into the Sarlaac pit.
Split into simpler sentences: Luke frees himself and a fight ensues with Jabba's guards. Han inadvertently sends Boba Fett, who has been working for Jabba since delivering Han, flying into the Sarlaac pit.