There you have it, Polish IS more complicated.
Conjugations in Polish are no more complicated than they are in Spanish. And no one complains about the latter. See for example the two forms of "TO BE" (ser, estar) and phonetic similarities with their Polish equivalents.
SER = to be, but describing faculties, as in "I am tall", "You are clever"
Yo soy= I am = Ja jestem
Tú eres=You are = Ty jesteś
Él es= He is = On jest
Ella es= She is = Ona jest
Nosotros somos= We are = my jesteśmy
Vosotros sois= You-all are = wy jesteście
Ellos son= They are = Oni są
Ellas son = They are ( female gender) = One są
ESTAR = to be, but describing a state or location, as in "I am tired, happy", "I am at home".
Yo estoy= I am = Ja jestem
Tú estas= You are = Ty jesteś
Él está= He is = On jest
Ella está= She is = Ona jest
Nosotros estamos= we are = My jesteśmy
Vosotros estáis= you-all are = Wy jesteście
Ellos estan= They are = Oni są
Ellas estan=They are ( female gender) = One są