Complex sentence: Starting in the 1960s new solid-state devices capable of delaying the transmitter signal in a controlled way were introduced that led to the first practical large-scale passive electronically scanned array (PESA), or simply phased array radar.
Split into simpler sentences: Starting in the 1960s new solid-state devices capable of delaying the transmitter signal in a controlled way were introduced. That led to the first practical large-scale passive electronically scanned array (PESA), or simply phased array radar.