Complex sentence: Seeing that the floor is beginning to buckle, Sharon manages to pry Lisa off of her arm, which causes Lisa to fall onto a chandelier, breaking her fall, but soon lets go and smashes onto the glass table below.
Split into simpler sentences: Seeing that the floor is beginning to buckle, Sharon manages to pry Lisa off of her arm. Lisa then falls onto a chandelier, breaking her fall, but soon lets go and smashes onto the glass table below.