Complex sentence: As a result of the contracts with Russell and Aitken, Alexander Albon left the team and Nobuharu Matsushita returned to Japan to race in the 2018 Super Formula Championship.
Split into simpler sentences: As a result of the contracts with Russell and Aitken, Alexander Albon left the team. BWhile Nobuharu Matsushita returned to Japan to race in the 2018 Super Formula Championship.