By Jude Summerfield Jadon Sancho admitted he is aiming to be “happy again” after grabbing an assist just 22 minutes into his second debut with Borussia Dortmund on Saturday. The England winger was ostracised from the Manchester United squad after falling out with manager Erik ten Hag and returned to former club BVB on loan for the remainder of the season earlier this week. He wasted little time making an impact in Dortmund’s 3-0 win at Darmstadt, setting up Marco Reus to double the visiting side’s lead after Julian Brandt had put them ahead in the first half. Youssoufa Moukoko sealed all three…