Complex sentence: He wanted to keep his promise of allowing WP's chief J. B. Jeyaretnam to contest an election upon the latter's ten-year ban ending just after the 1991 GE and who accused the PAP of calling a snap election because it was afraid of him.
Split into simpler sentences: He wanted to keep his promise of allowing WP's chief J. B. Jeyaretnam to contest an election upon the latter's ten-year ban ending just after the 1991 GE. Jeyaretnam had also accused the PAP of calling a snap election because it was afraid of him.