Complex sentence: However, on March 12,2013 he was declared by the Supreme Court as the true winner, he took his oath six days later, on March 18; and on April 11, it reversed its ruling and remanded the case back to the COMELEC.
Split into simpler sentences: However, on March 12,2013 he was declared by the Supreme Court the true winner, he took his oath six days later on March 18. On April 11, it reversed its ruling and remanded the case back to the COMELEC.