“Ahmad” has separate letters, but the letters are not intended to denote parts of the person Ahmad; as an ordinary proper name, it is mufrad.
“Ahmad arrived” has the meaningful parts Ahmad and arrived, which jointly form the proposition; it is murakkab. Thus distinguish spelling from intended semantic contribution. A simple name can be a part of a composite sentence.
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Letters in a name versus semantic parts of an expression
Simple and Composite Expressions: Definitions, Four Forms, and Examples
“Ahmad” has separate letters, but the letters are not intended to denote parts of the person Ahmad; as an ordinary proper name, it is mufrad.
“Ahmad arrived” has the meaningful parts Ahmad and arrived, which jointly form the proposition; it is murakkab. Thus distinguish spelling from intended semantic contribution. A simple name can be a part of a composite sentence.