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#!/usr/bin/perl

...
1 while s/\b(\d+:\d+:)[\d,-]+\K; \1([\d,-]+)/,$2/;

print "$_\n";

43:1:1; 43:1:2; 43:1:3; 43:1:4; 43:1:5; 43:1:6; 43:1:9; 43:1:10; 27:3:
+2; 27:3:7; 27:3:8; 27:3:9; 65:1:4; 65:1:18; 65:1:28
43:1:1-6,9-10; 27:3:2,7-9; 65:1:4,18,28