Complex sentence: Both the Gillette GPA and Oxford 100 models used 8 digit displays with red light-emitting diodes (LEDs), 4 functions, 9 volt PP3 batteries, and measured 73 x 155 x 34 mm (2.9 x 6.1 x 1.3 inches).
Split into simpler sentences: Both the Gillette GPA and Oxford 100 models used 8 digit displays with red light-emitting diodes (LEDs), 4 functions, 9 volt PP3 batteries. Both models measured 73 x 155 x 34 mm (2.9 x 6.1 x 1.3 inches).