Number of keywords is an approximate measure of complexity.
C (K&R) K&R 32
C++ 1991 48
Java 3rd edition 50
C# 2010 77
C++0x 2010 72+11*
JavaScript ECMA-262 26+16*
Python 2.7 31
Pascal ISO 35
Modula-2 1980 40
Oberon 1990 32
Go 2010 25