Complex sentence: The store manager is responsible for the quality of staff in the store, he should train them to a level where the staff can handle the customer very easily.he should see that the staff should be always cheerful and eager to help the consumer.
Split into simpler sentences: The store manager is responsible for the quality of staff in the store, he should train them to a level where the staff can handle the customer very easily. He should see that the staff should be always cheerful and eager to help the consumer.