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For a screenplay, it is probably more important to be clear than to have excellent, flowing prose. (I'm not a screenwriter.) For the more-general case of descriptive prose, however, one approach ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7815 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
For a screenplay, it is probably more important to be clear than to have excellent, flowing prose. (I'm not a screenwriter.) For the more-general case of descriptive prose, however, one approach is to convert "they are" verbal clauses to adjectival clauses. Instead of: > Hundreds of people are standing and looking at the on-coming train. Their sweating faces [are?] encrusted with dust, and they are wearing old clothes and shoes. Try something like: > Hundreds of people, clad in old clothing and their sweating faces encrusted with dust, are standing and looking at the on-coming train. (I also converted "old clothes and shoes" to "old clothing" there.) _How_ you do this depends on which aspects of the description are most important. You don't want to pile on a bunch of adjectival clauses (covering both the clothing and their faces in one sentence seems borderline to me), but as you've noted, you also don't want to string along a bunch of "oh yeah, and..." descriptive sentences. So focus on the ones that are most important for telling your story, and let the rest emerge naturally later -- or not. To apply that advice, consider instead a longer passage like: > Hundreds of people, sweating faces encrusted with dust, stand and watch the on-coming train. (Something happens.) (Somebody watches) the sea of people, all clad in well-worn dusty clothes, swarm toward the doors. (Etc). The point here is to add the descriptive detail as it fits, rather than loading it all up at the beginning.