جَاءَنِي زَيْدٌ وَعَمْرٌو
Zayd and ʿAmr came to me.
جَاءَنِي زَيْدٌ وَجَاءَنِي عَمْرٌو
Zayd came to me, and ʿAmr came to me.
The first coordinates two subjects under one predicate. The second coordinates two full clauses, repeating the verb. Both are grammatical, but the rhetorical economy is different.
Subject coordination is useful for concise enumeration; clausal coordination can give each report its own syntactic presentation.
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ʿAṭf al-Bayān, Badal and Coordination: Clarifying, Reinforcing and Specifying the Subject
جَاءَنِي زَيْدٌ وَعَمْرٌو
Zayd and ʿAmr came to me.
جَاءَنِي زَيْدٌ وَجَاءَنِي عَمْرٌو
Zayd came to me, and ʿAmr came to me.
The first coordinates two subjects under one predicate. The second coordinates two full clauses, repeating the verb. Both are grammatical, but the rhetorical economy is different.
Subject coordination is useful for concise enumeration; clausal coordination can give each report its own syntactic presentation.