Complex sentence: At a particular instant the rock is a specific distance from the surface of the earth traveling at a specific speed, this is also a form of information which for that instant only is "stored" in the rock.
Split into simpler sentences: At a particular instant the rock is a specific distance from the surface of the earth traveling at a specific speed. Both the current distance and speed properties are also forms of information which for that instant only may be considered "stored" in the rock.