the foundations of the exact natural sciences were, therefore, first worked out by the greeks of the alexandrian period [b], and later on, in the middle ages, by the arabs. real natural science dates from the second half of the 15th century, and thence onward it had advanced with constantly increasing rapidity.

How would the previous sentence be correctly capitalized?
Answer: The foundations of the exact natural sciences were, therefore, first worked out by the Greeks of the Alexandrian period [B], and later on, in the Middle Ages, by the Arabs. Real natural science dates from the second half of the 15th century, and thence onward it had advanced with constantly increasing rapidity.
missing or deleted maps can recovered easily.

How would the previous sentence be correctly capitalized?
Answer: Missing or deleted maps can recovered easily.
the six strings of a guitar is called "a set of strings".

How would the previous sentence be correctly capitalized?
Answer: The six strings of a guitar is called "a set of strings".
other information such as names, functions or titles can frequently change. here, editable inscriptions which can be changed with minimal expense are the obvious option.

How would the previous sentence be correctly capitalized?
Answer: Other information such as names, functions or titles can frequently change. Here, editable inscriptions which can be changed with minimal expense are the obvious option.