You need a colon (:) at the end of your last if. Also, you cannot break instructions into multiple lines, unless you use two backslashes (\\) at the end of lines to indicate continuation in the next line.
Also, it's much easier to express what you want like this:
bp_rate = int(input("What is the BP rate of your patient? "))
if bp_rate > 120:
print("Your patient has high BP rate.")
elif bp_rate < 80:
print("Your patient has low BP rate.")
else:
print("Your patient is fine. :D")