Staff reductions to the tune of more than 800 people, the exit of top CBS brass, new executives with digital expertise, less investor worry about carriage deals, cash-generating asset sales, and all that amid the coronavirus pandemic – those were key themes of the first year of the recombined ViacomCBS. And, notably,Sumner Redstone, the mogul who created National Amusements, the family holding company that controls ViacomCBS, died in August at 97.