> C has "saved" you the work of putting parentheses around (a+b) at the cost of making you add commas to everything.
Not only that but also at the cost of putting a comma which is spelled + between all the terms of a addition:
myfunction(a(),b()+c()+d()+e()+f(),g())
(myfunction(a)(+(b)(c)(d)(e)(f))(g))