When the expressions to be combined are small, write a cascade of sequential combinators all on the same line.
F >x> G >y> H
When the expressions to be combined are individually long enough to take up a full line, write one expression per line; each line ends with the combinator which binds the publications produced by that line.
long expression >x> long expression >y> long expression
For very long expressions, or expressions that span multiple lines, write the combinators on separate lines, indented, between each expression.
very long expression >x> very long expression >y> very long expression