In descriptive writing, the maximum sentence length is 25 words. This is because descriptive text is more complex than procedural text.
STE: During the approach to the runway, deviation pointers in the course indicators show the pilot in which direction the aircraft must go. (22 words)
Non-STE: A smartphone is a cellular telephone that has an integrated computer and many other qualities, such as an operating system, internet browsing as well as the ability to run software applications. (31 words)
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