Complex sentence: Sterile technique is highly important here, as a line may serve as a "porte d'entrée" (place of entry) for pathogenic organisms, and the line itself may become infected with organisms such as "Staphylococcus aureus" and coagulase-negative Staphylococci.
Split into simpler sentences: Sterile technique is highly important here, as a line may serve as an entry point for pathogenic organisms. Additionally, the line itself may become infected with organisms such as "Staphylococcus aureus" and coagulase-negative Staphylococci.