It's important to understand that metamorphic rocks don't become sedimentary rocks directly. They are two distinct rock types formed through different processes. Here's the breakdown:

1. Weathering and Erosion: The metamorphic rock must first be exposed to the Earth's surface. Here, it will experience weathering (breakdown of the rock due to factors like wind, water, ice, or chemical reactions). This will break the metamorphic rock into smaller pieces called sediment.

2. Transportation: The sediment will then be transported away from its original location by wind, water, or ice. This process can carry the sediment over long distances.

3. Deposition: Eventually, the sediment will be deposited in a new location, often in layers. This deposition occurs when the transporting agent loses energy, such as when a river slows down or the wind weakens.

Once the sediment has been deposited, it undergoes lithification, which involves compaction and cementation. This process turns the loose sediment into a solid sedimentary rock.

So, to summarize:

1. Weathering and erosion break the metamorphic rock into sediment.

2. Transportation carries the sediment away.

3. Deposition lays down the sediment in a new location.

These processes are followed by lithification, which completes the transformation into sedimentary rock.