This two sentences means the same? What is the difference? Please
She had been cleaning when I arrived.
She was cleaning when I arrived.

Question

This two sentences means the same? What is the difference? Please
She  had  been cleaning when I arrived.
She was cleaning when I arrived.

Answer

(she had been cleaning when I arrived)thats mean (she finished cleaning then i arrived)
(she was cleaning when I arrived)mean (she was cleaning and my arrive Interrupt the cleaning event)

Answer

"She had been cleaning when I arrived" indicates that she had stopped before your arrival.
"She was cleaning when I arrived" indicates she was still in the process of cleaning at the time of your arrival.