Complex sentence: In 2013--2014, Martiusheva/Rogonov started their season competing at the Lombardia Trophy and won the silver medal, their next assignment will be at the Ondrej Nepela Memorial, and one Grand Prix event, the 2013 Cup of China.
Split into simpler sentences: In 2013--2014, Martiusheva/Rogonov began their season by taking silver at the Lombardia Trophy. Their next assignment is the Ondrej Nepela Memorial, followed by one Grand Prix event, the 2013 Cup of China.