Complex sentence: For instance, on December 28,2010,4chan and other websites went down due to a such an attack, following which Poole said on his blog, We now join the ranks of MasterCard, Visa, PayPal, et al.
Split into simpler sentences: For instance, on December 28,2010,4chan went down due to a such an attack. Christopher Poole said on his blog We now join the ranks of MasterCard, Visa, PayPal, et al.