Complex sentence: Kar uses dual edged vibroshields made of superconductive material-indicatively harvested from Jedi spaceships crashed centuries ago-which are resistant to lightsabers, but not to each other.
Split into simpler sentences: Kar uses dual edged vibroshields made of superconductive material harvested from Jedi spaceships that crashed centuries before. The vibroshields so fashioned are resistant to lightsabers but not to each other.