Complex sentence: Avast! is based on a central scanning engine that is certified by ICSA Labs and West Coast Lab's Checkmark process and incorporates anti-spyware technology, also certified by West Coast Lab's Checkmark process, as well as anti-rootkit and self-protection capabilities.
Split into simpler sentences: Avast! is based on a central scanning engine that is certified by ICSA Labs and West Coast Labs'Checkmark process. Avast also offers anti-spyware technology, also certified by West Coast Labs' Checkmark process, as well as anti-rootkit and self-protection capabilities.