#!/bin/bash
s='chr20 102 K245 A T 56.0 AC.02 AC=0.1;DC=45;AC_old=452;DP=21;sample=kj;sample_name=DKl;New_sample=rdf
chr10 8742 JH245 G T 86.0 AC.742 AC=2.1;DC=75;AC_old=42;DP=1;sample=KHS;sample_name=WEKl;New_sample=ASEf
chrX 2302 XS245 G A 786.0 AC.452 AC=8;DC=5;AC_old=4A2;DP=5;sample=SED;sample_name=MHNSKl;New_sample=rdf'
awk -F\; '$1 ~ /AC|DC|sample/{print $1 OFS $2 OFS $5}' <<< "$s"