Thou Shalt observe the Nearness Rule. In essence, the rule insists that modifiers remain close to what they modify. Instead, Sally Jones, at 28, is a super saleswoman. Or, At 28, Sally Jones is a super saleswoman. Thou Shalt put statements into positive form.
Negative form weakens writing and creates a poor tone.
He was not very often on time, try He usually came late. Thou Shalt keep the reader informed of time and place changes. Clear understanding stems partly from the reader knowing the where and when of all references. Thou Shalt have a theme. Writing to theme is all important.