Complex sentence: The increased risk can be viewed as moderate, with deficiencies in anticoagulants (Protein C and Protein S) giving a higher risk (5-to 10-fold), but carriers who take oral contraceptives are at a 15-to 30-fold increased risk of venous thrombosis.
Split into simpler sentences: The increased risk can be viewed as moderate, while deficiencies in anticoagulants (Protein C and Protein S) give a higher risk (5-to 10-fold). Carriers who take oral contraceptives are at a 15-to 30-fold increased risk of venous thrombosis.