Complex sentence: Operation Safe Winter was an effort to raise awareness about life on the street through the collection, collation and redistribution of resources which began on November 7,2013 after an online call to action from Anonymous UK.
Split into simpler sentences: Operation Safe Winter was an effort to raise awareness about homelessness through the collection, collation, and redistribution of resources. This program began on 7 November 2013 after an online call to action from Anonymous UK.