Complex sentence: Nonstructural proteins consist of NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5, which are involved in viral replication or act as proteases.
Split into simpler sentences: Nonstructural proteins consist of NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5. These proteins are mainly in viral replication or act as proteases.