Step 1: Examine Part A - "The company announced''
This is a correct use of past tense.
Step 2: Examine Part B - "a new strategy to improve''
This phrase is grammatically sound.
Step 3: Examine Part C - "the product's saleability''
"Saleability'' (also spelled "salability'') is an acceptable word meaning marketability.
Conclusion: No grammatical error exists in any part of the sentence.