Complex sentence: Later, two variants of the fighter received their own code names: the Nakajima A6M2-N (floatplane version of the Zero) was called "Rufe" and the A6M3-32 variant was initially called "Hap".
Split into simpler sentences: Later, two variants of the fighter received their own code names. The Nakajima A6M2-N floatplane version of the Zero was called "Rufe", and the A6M3-32 variant was initially called "Hap".