Overall meaning :
I swear by the day when its light spreads in the forenoon and by the night when it grows still and intensely dark that your Lord, Muhammad, has not forsaken you, nor is He displeased with you. The reward in the life to come is far better for you than this present life and everything in it, and your Lord will bestow so much good on you until you are well-pleased.
Did He not find you, Muhammad, an orphan and made others shelter you and take care of you? Did He not find you totally unaware of knowledge of the Qur’an and faith and taught you and guided you to them? Did He not find you poor and made you self-sufficient? Therefore, do not humiliate and oppress the orphans, nor berate and drive away those who ask your help, but do speak to people about the favours that your Lord has bestowed upon you.