Complex sentence: His permanent elastic powers manifest after the S.T.A.R. Labs team open up the Speed Force to free Barry, which opens a breach in front of a city bus Ralph was riding on, exposing it to dark matter, transforming the passengers into metahumans.
Split into simpler sentences: His permanent elastic powers manifest after the S.T.A.R. Labs team open up the Speed Force to free Barry. A breach in front of a city bus Ralph was riding on, exposing it to dark matter and transforming the passengers into metahumans.