The vaccination is made each year so that it contains the influenza virus strains that are expected to cause illness that year.
(The vaccination; is made; T:each year; so that it contains the influenza virus strains) (it; contains; the influenza virus strains that are expected to cause illness that year) (the influenza virus strains; are expected; ) (the influenza virus strains; to cause; illness; T:that year)
The vaccination it the influenza virus strains the influenza virus strains
is made contains are expected to cause
T:each year so that it contains the influenza virus strains
the influenza virus strains that are expected to cause illness that year
illness T:that year