I'm trying to set a rule for Subjects and Verbs Agreement and my rule is
"When the subject of a sentence is composed of two or more nouns or pronouns connected by and, use a plural verb.".
For example, in the below sentence as the subject is composed of two nouns patient and Cavernoma and it is connected by and, so the following verb was should take plural form were.
The patient recovered well and no adverse events including further bleeding of the Cavernoma was observed.
Can you please help me write out a rule for the above.
Thanks in advance.