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Generally speaking, I think it looks good.
I went mostly through the grammar and split sentences to improve the readability. However, I did not come up with a nice solution for the sentence starting in l. 38. I do not really like the way we have it written right now as it is a bit convoluted and really long. That makes it hard to understand.
One suggestion is
TimeStruct simplifies the writing of key equations in optimization problems through separation of the indexing sets and the equation. Consequently, equations unaffected by the the chosen time structure, e.g., simple deterministic operational or stochastic programming models, must not be adjusted when switching between different time structures. Hence, it simplifies both model development and subsequent switching between different time structures.
What are your thoughts? Is that paragraph still capturing the essence of he previous paragraph?