Complex sentence: There are 13 recognised genotypes based on the sequence of the E1 protein-1a, 1B, 1C, 1D, 1E, 1F, 1G, 1h, 1i, 1j, 2A, 2B and 2C.
Split into simpler sentences: There are 13 recognised genotypes based on the sequence of the E1 protein. These include 1A, 1B, 1C, 1E, 1F, 1G, 1H, 1J, 2A, 2B and 2C.