Complex sentence: For example, consider a program fragment containing three statement groups inside a loop: (SSC1 + SSC2), SSC3 and SSC4, in that order, in which only the second group (SCC3) can be vectorized.
Split into simpler sentences: For example, suppose a program fragment containing three groups inside a loop: (SSC1 + SSC2), SSC3 and SSC4. Now, imagine that only the second group (SCC3) can be vectorized.