The phrase "lets for" can be replaced with a variety of synonyms depending on the context. Some common alternatives include "bring about," "facilitate," "generate," "initiate," "promote," or "propel." Each of these words implies a sense of action or movement, indicating that something is being launched or set in motion. Depending on the specific meaning or tone you want to convey, you might choose one of these more active verbs over "lets for." Alternatively, you might opt for a completely different construction altogether, like "makes possible" or "opens the door to." Whatever phrasing you choose, it's important to consider the nuances of language and what impact your words will have on your reader or listener.