Complex sentence: The Hong Kong Chinese Orchestra began their research for an alternative to python skin in 2005 and has since designed the Eco- "huqin" series, which substitutes python skin with PET Polyester Membrane.
Split into simpler sentences: The Hong Kong Chinese Orchestra began their research for an alternative to python skin in 2005. The Orchestra has successfully designed the Eco- "huqin" series, which substitutes python skin with PET Polyester Membrane.