Complex sentence: Instruments are usually a basic set given the size of the panel, it consists of variometer, altimeter, speed indicator in the top line and two smaller engine instruments below (revolution counter and valve head temerature indicator).
Split into simpler sentences: Instruments are usually a basic set given the size of the panel. It consists of variometer, altimeter, speed indicator in the top line and two smaller engine instruments below (revolution counter and valve head temperature indicator).