Complex sentence: Two more years with Manthey in the German series saw no significant improvement and Davison returned home to Australia during 2003 and made some appearances in the 2003 Australian Carrera Cup Championship.
Split into simpler sentences: Two more years with Manthey in the German series saw no significant improvement and Davison returned home to Australia during 2003. Back in Australia, Davison made some appearances in the 2003 Australian Carrera Cup Championship.