Is the sentence below grammatically correct? Is it comprehensible? [closed]

out of context: Gray had already provided a survey in 1995 amongst 2518 SMEs, with the result of 52% of the entrepreneurs having claimed that independence meant being bosses to ourselves or making a decision solely on our own.

Is it grammatically correct?

Yes, however, the comma after "SMEs" indicates the last two thirds of the sentence are an "aside".

Is it comprehensible?

Yes, but I'd shorten it to:

Gray had already surveyed 2518 SMEs in 1995. 52% of the surveys showed that entrepreneurs defined independence as "being bosses to ourselves" or "making a decision solely on my own".