Complex sentence: In addition an anti-aircraft battery of 4.7 inch guns was included with dedicated fire control equipment, whereas in previous ships the anti-aircraft guns could only be manually-aimed in the rough direction of approaching aircraft, a method which proved ineffective.
Split into simpler sentences: In addition an anti-aircraft battery of 4.7 inch guns was included with dedicated fire control equipment. In previous ships the anti-aircraft guns could only be manually-aimed in the rough direction of approaching aircraft, a method which proved ineffective.