# the Son of Man ... his life

Jesus is speaking about himself in the third person. If necessary, you can translate this in the first person. 

# did not come to be served

Alternate translation: "did not come so that other people would serve him" or "did not come so that other people would serve me" 

# but to serve

Alternate translation: "but to serve other people" 

# to give his life as a ransom for many

Alternate translation: "to give his life as a substitute for many" or "to give his life as a substitute to set many free" 

# to give his life

Alternate translation: "to die" 

# for many

Alternate translation: "for many people"