RobH_en_tn/ezk/27/25.md

The ships of Tarshish were the transporters of your merchandise

This can be stated in active form. Alternate translation: "The ships of Tarshish carried your merchandise" (See: rc://en/ta/man/translate/figs-activepassive)

you were filled up, heavily laden with cargo

Tyre's abundance is spoken of as if it was a ship that was full of cargo. (See: rc://en/ta/man/translate/figs-metaphor)

heart of the seas

"middle of the seas." See how you translated this in Ezekiel 27:4.