Sentence Construction

Could someone tell me if my analysis of the following sentences are correct? I'd very much appreciate your help!!!
1. "The vote, which may take place late in the afternoon, was delayedlast week to give African Union officials a chance to negotiate a truce between rebels, who control the north of the country, and the government, which holds the south."
2. "A summit among West African leaders in Abuja, Nigeria on Sundaybacked the arms embargo and asked that it be imposed immediately, rather than on Dec. 10 as a draft resolution says, presumably to stop the collection of more weapons."
Answers:

the vote >subj
which..afternoon >sub clause functioning as an adjective clause, coz of the usage of the relative pronoun(which).Here vote is a noun, and the sub clause adds some additional infi to the noun hence an adjectiv clause.
was delayed verb in the past tense
was helping verb
The vote was delayed main clause
last week adverb(it's not necessary)
{ to give african..chance infinitive phrase}
//adverb clause as it modifies the verb by asking the Qn: why was it delayed?
{to negotiate ..rebels infinitive phrase} // again an adverb clause, becoz an adverb can modify another adverb, why do they want to give a chance?
who...south adjective clause with the relative pronoun

A summit subj
among..Nigeria prepositional phrase
on sunday adverb
backed verb in the past form
arms embargo direct object
a summit..embargo >main clause
and { the summit } subj
asked verb
that it..imposed >adjective clause with the relative pronoun 'that'
rather..says adverb clause
presumably adverb
to stop the collection ..weapons >infinitive phrase