For efficient decomposition, a compost pile needs a good balance of materials containing nitrogen, such as fresh manure, grass clippings, other green materials, 
(a compost pile; needs; a good balance of materials) (materials; containing; nitrogen, such as fresh manure, grass clippings, other green materials)
a compost pile materials
needs containing
a good balance of materials
nitrogen, such as fresh manure, grass clippings, other green materials