10:26a Solomon accumulated 1,400 chariots and 12,000 horses,

Solomon gathered great quantities of chariots and horses, ⌊eventually/finally⌋ owning fourteen hundred chariots and twelve thousand horses.
-or-
Solomon bought for himself many war carts and horses ⌊to pull them⌋. He came to possess fourteen hundred war carts and twelve thousand horses.

10:26b which he stationed in the chariot cities and also with him in Jerusalem.

Some of these he kept in the chariot cities and others with him in Jerusalem.
-or-
He housed/stored some in special/designated cities and others ⌊he housed/stored⌋ in his city of Jerusalem.

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