Complex sentence: Right whales can grow up to more than long with the maximum record of and weigh up to or more; with Omura, H., S. Ohsumi, K. N. Nemoto, K. Nasu, and T. Kasuya.
Split into simpler sentences: Right whales can grow up to more than long with a highest-recorded length of. They weigh or more with Omura, H., S. Ohsumi, K. N. Nemoto, K. Nasu, and T. Kasuya.