He repeated all the published experiments several times and redesigned many because his colorblindness hindered his observations.
(He; repeated; all the published experiments; T:several times) (He; redesigned; many; because his colorblindness hindered his observations) (his colorblindness; hindered; his observations)
He He his colorblindness
repeated redesigned hindered
all the published experiments T:several times
many because his colorblindness hindered his observations
his observations