LAS VEGAS — No one said it was going to be easy, and the bankruptcy of Caesars Entertainment’s debt-heavy operations arm has been anything but as it appears to be growing even more complex and lengthier than expected. With some $18 billion in debt and tens of thousands of employees scattered around some 38 hotels and casinos, Caesars Entertainment Operating Co. revealed this week in court filings just how complex the hulking enterprise is: hundreds of legal entities, at least one that has no assets and no …