Complex sentence: These surface proteins, lipoproteins called variable major proteins, have only 30-70% of their amino acid sequences in common, which is sufficient to create a new antigenic "identity" for the organism.
Split into simpler sentences: These surface proteins, called variable major proteins (VMP), are lipoproteins that have only 30-70% sequence in common. This amount of divergence in the amino acid sequence is sufficient to create a new antigenic "identity" for the organism.