This is more or less a hint for me how to do it. Maybe it helps you, too.
openssl pkcs12 -in example.com.pfx -clcerts -nokeys -out example.com.crt openssl pkcs12 -in example.com.pfx -nocerts -out example.com-encrypted.key openssl rsa -in cert-encrypted.key -out example.com.key openssl pkcs12 -in example.com.pfx -cacerts -nokeys -out ca-cert.ca
Then in the apache config
SSLCertificateFile certs/example.com.crt SSLCACertificateFile certs/ca-cert.ca SSLCertificateKeyFile certs/example.com.key