PIPER PA28 PLT INADVERTENTLY CLBED INTO CLASS B AIRSPACE DURING A FLT REVIEW CONDUCTED BENEATH THE CLASS B AIRSPACE.

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I WAS CONDUCTING A FLT REVIEW IN A PA28TR. WE DEPARTED CRQ WITH THE CLOUD COVER BEING 2800 FT BROKEN; TOP OF BROKEN AT 5000 FT. WE THERE WERE CUMULUS BUILD-UPS IN ALL QUADRANTS AND DURING THE FLT WERE MAKING NUMEROUS HDG CHANGES TO MAINTAIN VFR. AT THE TIME OF THE CLASS B PENETRATION; THE PLT WAS DEMONSTRATING TKOF AND DEP (PWR-ON) STALLS. WE STARTED AT 6000 FT MSL AND; DURING THE CLB; THE ACFT STALLED AT 7300 FT MSL. AT THAT LOCATION; THE CLASS B AIRSPACE IS 100/68 AND I WAS CONDUCTING THE FLT UNDER CLASS B AIRSPACE. IN THE CLB; THE RATE OF CLB WAS MORE THAN I EXPECTED (THE ACFT WAS TURBOCHARGED). AS THE ACFT STALLED; I OBSERVED THE GPS AND IT INDICATED THAT WE WERE IN CLASS B AIRSPACE. WE IMMEDIATELY DEPARTED THE CLASS B AIRSPACE BY DSNDING AND CHANGING HDG TO 360 DEGS. I FEEL THAT THE CAUSE WAS LACK OF POSITIONAL AND ALT AWARENESS. I HAVE BEEN FLT INSTRUCTING IN THE LAX/SAN AREA FOR 41 YRS; SO I'M NOT A STRANGER TO THE AIRSPACE IN THE AREA. I DO FEEL THAT THE AIRSPACE RESTRS HAVE BEEN ADDED TO AND CHANGED OVER THE YRS AND IT IS TOO COMPLEX. I FEEL THAT THE FAA SHOULD START OVER WITH A 'CLEAN PIECE OF PAPER' AND MAKE THE AIRSPACE MORE USER FRIENDLY.