Complex sentence: In February, at No Way Out, Undertaker won an Elimination Chamber match to become the number one contender to the World Heavyweight Championship at WrestleMania XXIV, where he defeated Edge to win the title and extend his WrestleMania undefeated streak to 16--0.
Split into simpler sentences: In February, at No Way Out, Undertaker won an Elimination Chamber match to become the number one contender to the World Heavyweight Championship at WrestleMania XXIV. At WrestleMania, Undertaker defeated Edge to win the World Heavyweight Championship and extend his WrestleMania undefeated streak to 16--0.