أَنَا ابْنُ التَّارِكِ الْبَكْرِيِّ بِشْرٍ
عَلَيْهِ الطَّيْرُ تَرْقُبُهُ وُقُوعًا
Translation: I am the son of the one who left Bishr of the Bakr tribe, with birds over him watching and ready to descend.
The grammatical crux is الْبَكْرِيِّ بِشْرٍ. «بِشْرٍ» is a personal name, clarifying the man described as «الْبَكْرِيِّ».