Complex sentence: The art continues to evolve even though John Harvey left the organisation in 2000 to form his own group this is when the system was renamed Rapid Arnis International also due to the fact that it had now become a truely internationaly recognised system.
Split into simpler sentences: The art continues to evolve even though John Harvey left the organisation in 2000 to form his own group. It was at this point that the system was renamed Rapid Arnis International, the new name also reflectling the fact that it had now become a truly internationaly recognised system.