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Future pilots train in simulators.
Literal
Future's pilots [topic-は] simulator control-room [in-で] are-trained.
模擬 ('mock, simulated') + 操縦室 ('control room') builds the compound 'simulator' (literally 'mock piloting room'). 訓練される is the passive of 訓練する ('to train [someone]') — here the pilots are the ones being trained, so the passive makes them grammatical subject. で marks the location of the training action.