Here's how the neither ... nor construction works.
You have two clauses, each with the same beginning:
[A] NOT [B1] ... [He could] not [clearly identify the man who attacked him]
AND and
[A] NOT [B2] ... [he could] not [name the weapon with which he was attacked]
Substitute neither for the first NOT and nor for the second NOT; AND is deleted; [A] is common to both clauses, so it may be omitted on its second appearance. That leaves:
[A] neither [B1] nor [B2] ... [He could] neither [clearly identify the man who attacked him] nor [name the weapon with which he was attacked]
You may also join two clauses with just neither, without nor; or with nor, without neither. This involves no deletion; neither or nor replaces and and you must put the finite verb of the second clause in the first position, immediately after neither :
He could not clearly identify the man who attacked him; neither could he name the weapon with which he was attacked.
He could not clearly identify the man who attacked him; nor could he name the weapon with which he was attacked.