Complex sentence: Telstra, though quite powerful in owning the telco network in Australia are losing the battle to build the network againist the G9 Group (SingTel Optus), which is a Singaporian Government owned company with partnerships with other Australian telco companies like iinet.
Split into simpler sentences: Telstra, though quite powerful in owning the telco network in Australia are losing the battle to build the network againist the G9 Group (SingTel Optus). Which is a Singaporian Government owned company with partnerships with other Austrlian telco companies like Iinet.