NBCUniversal has begun making staff cuts across its entertainment portfolio including its sports and cable channels, broadcast networks, movie studio and theme parks, according to people familiar with the matter.

The layoffs have been anticipated for several months and are primarily tied to the effect the coronavirus has had on many of the Comcast Corp. unit’s operations. Revenue at NBCU declined 25% to $6.1 billion in the second quarter, a result of theme park closures, the postponement of movie releases and advertising drops…