With two simplifications:
say [+] grep * %% (5|3), 1..10
Simplification #1. The code $_ %% 5 or $_ %% 3 can use a Junction instead: $_ %% (5|3). Junctions are designed mostly with the performance boost from automatic parallelism in mind but they can also aid readability.
Simplification #2. The compiler recognizes when a Whatever pronoun is used as an argument of an operator. For almost all operators it makes that operation its own block, replacing the Whatever with It ($_). So these are equivalent:
say [+] grep * %% (3|5), 1..10;
say [+] grep { $_ %% (3|5) }, 1..10;
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