For a sufficiently complex game, a mathematician would not be able to study the system and figure out a mathematically accurate set of rules.

A sufficiently complex and accurate model of the neurons is required.

The method is sufficiently complex that a few test sessions from a local phone might be a good idea before you depart for Timbuktu.

Many others may be sufficiently complex to require numerical methods of solution, aided by software.

The technology is sufficiently complex that no lay person will ever be able to make an informed choice.

Computer interfaces are sufficiently complex as to be treated this way.

The simulation is merely a means of delivering sufficiently complex data to myself and Dum.

This explanation, while convenient, may not be sufficiently complex to truly explain the equatorial paradox.

Most real-world complex services and systems are composed of sufficiently complex parts.

However, most trace fossils lack sufficiently complex details to allow such classification.