Complex sentence: Vera Bazarova/Yuri Larionov withdrew from the pairs' event due to Larionov breaking in new boots and were replaced by Anastasia Gubanova/Alexei Sintsov.
Split into simpler sentences: Vera Bazarova/Yuri Larionov withdrew from the pairs' event. They were replaced by Anastasia Gubanova/Alexei Sintsov.