Complex sentence: While many plant proteins are lower in one or more essential amino acids than animal proteins, especially lysine, and to a lesser extent methionine and threonine, eating a variety of plants can serve as a well-balanced and complete source of amino acids.
Split into simpler sentences: While many plant proteins are lower in one or more essential amino acids than animal proteins, especially lysine, and to a lesser extent methionine and threonine. Nonetheless, eating a variety of plants can serve as a well-balanced and complete source of amino acids.