Complex sentence: A factor in favor of the rook and bishop is that they can attack (or defend) a square twice, while a queen can only do so only once, but experience has shown that this factor is usually less significant than the points favoring the queen.
Split into simpler sentences: A factor in favor of the rook and bishop is that they can attack (or defend) a square twice, while a queen can only do so once. However, experience has shown that this factor is usually less significant than the points favoring the queen.