بسم الله الرحمن الرحيم
مِّنْهُمُ - from them**
الْمُؤْمِنُونَ - (are) the believing ones*
وَأَكْثَرُهُمُ - and (but) most of them*
الْفَاسِقُونَ- (are) the immoral/unchaste ones*
مِّنْهُمُ الْمُؤْمِنُونَ وَأَكْثَرُهُمُ الْفَاسِقُونَ
Translation: '...from them are the believing ones, and most of them are the immoral ones.'
* Firstly, I noticed the shaddah on the م too and thought that perhaps it is as a result of continuation from the verse beforehand. Also I noticed in an earlier verse, غَفُورٌ رَّحِيمٌ, notice that ر of رَّحِيمٌ has a shaddah on it. Perhaps this is not grammatical but for vocative purposes as there is a ر at the end of غَفُورٌ ?
* Also from the same part, I felt that when the preposition 'from' is used regarding people (and we know it is people referred to here as the sound masculine plural is used and not the singular feminine that is used for non-human plurals), it is likely they may talking about birth, i.e. that these people are borne from a certain person/group of people. So the translation could have been 'born from them are...'
* I put 'are' in the translation as this is a nominal sentence. I have read that the predicate may be definite if it is preceeded by a pronoun or if it itself is a pronoun. So here we have الْمُؤْمِنُونَ preceeded by the pronoun هُمْ. On top of this, without knowing the above - we can tell that الْمُؤْمِنُونَ is nominative, indicated by و.
* Here أَكْثَرُ (MOST of) is in a Superlative structure (the adjective's most quantative form), i.e. it is an adjective (كَثِيرٌ) (much) in the form of أفْعَلُ and attached to a genetive definite noun or pronoun, i.e. هُمْ (they)
Note: The Comparative structure (using the adjective to compare) must have a مِنْ in between and the adjective is indefinite, e.g. عالِمٌ (learned). This leads me to believe that the beginning of the verse cound be the second part of the comparitive structure as it started with مِنْ, so it could have been عالِمٌ مِّنْهُمُ الْمُؤْمِنُونَ (the learned of/among them are the believing ones) (I am unsure if عالِمٌ should have been in the plural form). This would also fit it with why the م has a shaddah as عالمٌ has a م at the end of it.
* فاسقٌ in Al-Mawrid, says it means, letch, immoral, debauched, unchaste - so the 'wrongdoing' is specific in this case, relating to chastity.
I hope my translation makes some sense إن شاء الله...What do you think?